Simple Case only allows equality check of Case_Expression with Value_1 to Value_N. What happens here? To learn more, see our tips on writing great answers. current_page_url ilike %optus.com.au/shop/home-phone% OR If flight tickets are between $100 to $200, then I will visit New York, If flight tickets are between $200 to $400, then I will visit Europe. CASE WHEN Value_1 THEN Statement_1In the above example, the only operation performed by the system is checking if Case_Expression = Value_1. The SQL CASE statement allows you to perform IF-THEN-ELSE functionality within an SQL statement. Could you please tell me how to do this or where to start. SQL Server and PostgreSQL dont have a DECODE function. Do roots of these polynomials approach the negative of the Euler-Mascheroni constant? Here is an example for a typical correlated subquery. Why are physically impossible and logically impossible concepts considered separate in terms of probability? The HAVING clause restricts the titles to those that are held by salaried employees with a maximum pay rate greater than 40 dollars, or non-salaried employees with a maximum pay rate greater than 15 dollars. A useful function in SQL is creating a query within a query, also known as a subquery or nested query. [ ELSE else_expression ] END Parameters boolean_expression AND g.itcl_id != 163 The OUTPUT clause is used to display the before and after vacation values. SELECT NUMEROLINEA, No problem Margaret, it was a good challenge for me! @ColonelPanic: The WHERE clause for the outer query would be tacked on at the very end. ) Then we can use ORDER BY to have the column in the order we prefer, with the number of students that passed on top.. g.itcl_id = 163 Aggregate expressions that appear in WHEN arguments to a CASE expression are evaluated first, then provided to the CASE expression. How do I perform an IFTHEN in an SQL SELECT? Syntax <case_expression> ::= <simple_case_expression> | <search_case_expression> <simple_case_expression> ::= CASE <expression> WHEN <expression> THEN . If there is no match found in any of the conditions, thats where the ELSE statement comes in. WHEN MILITARY_STATUSES (AANG,DODAG,FAMAG,VANG) INNER JOIN A001470.DIRECCION D WHEN MILITARY_STATUSES (ANAVY,DODNA,FAMNA,RNAVY,VNAVY) However, as I said, it is difficult. It checks the number of employees and determines if they have an odd or even number of employees. how do i incorporate a nested if statement in a select clause of a sql query? A case expression allows the user to use IF - THEN - ELSE logic without using procedures in SQL statements. WHEN USA THEN North America Lets have a look at SIMPLE CASE example below: Here, Tutorial_name is a part of CASE expression in SQL. If Case_Expression does not match with Value_1, then Case_Expression is compared with Value_2 for equivalency. The result gets evaluate for the TRUE/FALSE condition for each WHEN Statement. Returns the highest precedence type from the set of types in result_expressions and the optional else_result_expression. I know to use case when condition then X else y end but how do you do a nested one in the same fashion for each record in a record set. Staging Ground Beta 1 Recap, and Reviewers needed for Beta 2. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Bulk update symbol size units from mm to map units in rule-based symbology. CASE keyword is immediately followed by CASE_Expression and before WHEN statement. If you want to report an error, or if you want to make a suggestion, do not hesitate to send us an e-mail: W3Schools is optimized for learning and training. Hi Miro, g.itcl_id, And just in case the link breaks I am copying the content in: Case Expressions. : Did any DOS compatibility layers exist for any UNIX-like systems before DOS started to become outmoded? When case-operand is specified, when-condition is a shortened sql-expression that assumes case-operand as one of its operands and that resolves to true or false.. So, once a condition is true, it will stop reading and return the result. This occurs prior to evaluating the CASE expression. ON CF.IDCUENTAFACTURACION = ICF.IDCUENTAFACTURACION How do I UPDATE from a SELECT in SQL Server? Below Diagram illustrate the execution flow of the Searched Case. ELSE Unknown For more information, see Data Type Precedence (Transact-SQL). For example, you can use CASE in statements such as SELECT, UPDATE, DELETE and SET, and in clauses such as , IN, WHERE, ORDER BY, and HAVING. I'm having trouble getting a CASE statement to work in a nested select. Thank you very much, WHEN Value_1 THEN Statement_1 SELECT CASE WHEN score >= 60 THEN "passed" ELSE "failed" END AS result, COUNT(*) AS number_of . If Boolean_expression_1 is FALSE, then Boolean_expression_2 is evaluated for TRUE condition. Let's illustrate with an example. The nature of simulating nature: A Q&A with IBM Quantum researcher Dr. Jamie We've added a "Necessary cookies only" option to the cookie consent popup. The following example displays the list price as a text comment based on the price range for a product. current_page_url ilike %optus.com.au/shop/entertainment% OR The following example uses the CASE expression in a HAVING clause to restrict the rows returned by the SELECT statement. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. However, if City is NULL, then order by Country: Get certifiedby completinga course today! In the above example CASE is NESTED inside another CASE statement: The system starts with executing the outer CASE. WHERE expression comparison_operator [ANY | ALL] (subquery), ALL [>ALL or ALL operator takes the list of values produced by the inner query and fetches all the values which are greater than the maximum of the list. (AVG(NULLIF(count_scan_map, 0))) AS avg_scanmap, WHEN MILITARY_STATUSES = FAMAF,FAMAG,FAMAR,FAMCG,FAMMA,FAMNA,FAMNG The CASE statement should exit when it reaches the first TRUE condition. Applies to: The nature of simulating nature: A Q&A with IBM Quantum researcher Dr. Jamie We've added a "Necessary cookies only" option to the cookie consent popup. While using W3Schools, you agree to have read and accepted our. Your email address will not be published. In MS SQL, there are two types of CASE: Simple CASE and Searched CASE. THEN DOD Your query and pattern is fine, but your subquery needs an alias: Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. current_page_url ilike %addBundleToCart%) AND They've been part of the SQL standard since 1992, although Oracle SQL didn't . operators ( AND, OR ). The Goal: To compare my "Status_W1" column with my "Status_Now" column to see if there was a shift in pipeline to higher stages in the sales funnel. If you want to know more, just leave a comment below. Let's do a bit of different analysis on these data. >ALL(100,200,300), the ALL operator will fetch all the values greater than 300. select d.seq, Scan Map Layer Type, Avg from The statement returns the hourly rate for each job title in the HumanResources.Employee table. Learn how your comment data is processed. DECODE is older, and CASE was made as a replacement for DECODE. Could you test that the values in NUMEROTELEFONO are actually NULL? 102 (Hint: Union Operator / Case Statement). Within a SELECT statement, the CASE expression allows for values to be replaced in the result set based on comparison values. and exists (select x from CELL_STATES cs where cs.cell_id=g.cell_id Query 1: SEARCHED CASE with the NO ELSE option. I think I'm close but I can't quite get the syntax right. Learn more about this powerful statement in this article. The SQL CASE Expression The CASE expression goes through conditions and returns a value when the first condition is met (like an if-then-else statement). In addition to SELECT, CASE can be used with another SQL clause like UPDATE, ORDER BY. more expressions may be combined together using the logical While NULL can be returned from multiple result expressions, not all of these can explicitly be the NULL constant. Has 90% of ice around Antarctica disappeared in less than a decade? However, a couple of functions come close. I havent tested this query so you might need to tweak it if you get a syntax error. FROM A001470.PRODUCTOADQUIRIDO PA I find that examples are the best way for me to learn about code, even with the explanation above. so i want sal which has greater than avg(sal) ,if sal >avg(sal) then give flag Y other wise N? from idm.OPTUS_JOINED_VIEW_V_3_6 Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Programmatic interfaces for the case when in select statement in sql select, then oracle is sql join and analysis. PROVINCIA It's good for displaying a value in the SELECT query based on logic that you have defined. Thank you so much for this post. The procedural languages for each database do have an IF statement: This statement works just like other languages. Hi Juan, It should have the same result, but its a bit cleaner and has less code. As an alternative, the PL/SQL programmer can pre-define the cursor's SELECT-statement in advance to (for example) allow re-use or make the code more understandable (especially useful in the . The first takes a variable called case_value and matches it with some statement_list. (CASE WHEN current_page_url %optus.com.au/shop/broadband/nbn% THEN Fixed_NBN select d.seq, Historical Layer Type, Avg from Ive had a look at your query and yes I think it can be improved with CASE. i have employee table with column id, name, dept, salary Is it possible to create a concave light? The following example uses the CASE expression in an UPDATE statement to determine the value that is set for the column VacationHours for employees with SalariedFlag set to 0. I know you can use the CASE statement in either. Cookie Notice Employees that have the SalariedFlag set to 1 are returned in order by the BusinessEntityID in descending order. This means the WHEN expressions are all compared to that field. CASE can be used in any statement or clause that allows a valid expression. It doesnt make several steps on different variables to get the result you want. Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. : As the data for columns can vary from row to row, using a CASE SQL expression can help make your data more readable and useful to the user or to the application. Ill demonstrate this using more examples later in this article. rev2023.3.3.43278. With Boolean_Expression_N, Search Case support any operation which results in a Boolean value. Does a barbarian benefit from the fast movement ability while wearing medium armor? We use the following format to write Case statement logic in SQL queries. Syntax: There can be two valid ways of going about the case-switch statements. Minimising the environmental effects of my dyson brain. WHEN Value_2 THEN Statement_2, E.g. The Case Else clause is used to indicate the elsestatements to be executed if no match is found between the testexpression and an expressionlist in any of the other Case selections. case-operand. Specifies the default expression; then_expression and else_expression should all be same type or coercible to a common type. Can I tell police to wait and call a lawyer when served with a search warrant? My question is if you can use the SAME CASE statement in both places in the SAME query, with one referencing the other. Making statements based on opinion; back them up with references or personal experience. THEN ANG Yes, you can use a CASE within CASE in SQL. WHEN MILITARY_STATUSES (AMAR,DODMA,FAMMA,RMAR,VMAR) Its SQL Server only. FROM Margaret. In Oracle, there is no IF statement or keyword specifically in Oracle. WHERE STPR_STATUSES.POS=1 AND STPR_STATUS=A AND NOT EXISTS FROM ( CASE WHEN sub.product_theme = Hist AND sub.itcl_id != 163 THEN 1 ELSE 0 END count_hist See the following examples : Example -1 : Nested subqueries Calculating probabilities from d6 dice pool (Degenesis rules for botches and triggers). You should only depend on order of evaluation of the WHEN conditions for scalar expressions (including non-correlated subqueries that return scalars), not for aggregate expressions. If youre just using standard SQL in your application or database, then you can use the CASE statement. The CASE statement goes through conditions and return a value when the first condition is met (like an IF-THEN-ELSE statement). Check out this page here that lists all SQL functions along with links to their guides. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. By rejecting non-essential cookies, Reddit may still use certain cookies to ensure the proper functionality of our platform. CASE case_value WHEN when_value THEN statement_list [WHEN when_value THEN statement_list] . AND PERMIL_PRIMARY_FLAG=YES); Hi Deborah, I think this is because of the * character before the case. my question is if you want to put even and odd value in different column then how can i write the query. We will also then understand the concept of having a SELECT statement acting as a filter to other SELECT statement which is also called . The expressions are used within each condition without mentioning it at the start of the CASE statement. What video game is Charlie playing in Poker Face S01E07? Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, My answer has a few different ways to write your statement that are correct. What video game is Charlie playing in Poker Face S01E07? Specifies the then expression based on the boolean_expression condition; then_expression and else_expression should all be same type or coercible to a common type. The. Case Statement Example 3. So thanks for that one also. END) PERMIL_MIL_STATUS Asking for help, clarification, or responding to other answers. THEN RES ic.product_theme Why is this sentence from The Great Gatsby grammatical? INSERT INTO [PERMIL_STATUSES] (PERMIL_STATUSES.POS, PER_MILITARY_ID, PERMIL_MIL_STATUS, PERMIL_BRANCH, PERMIL_STATUS_START_DATE, PERMIL_STATUS_END_DATE,PERMIL_PRIMARY_FLAG) : Before formatting: SELECT DISTINCT c. LastName a , c. FirstName b After formatting, indent for 0 spaces: A place where magic is studied and practiced? E.g. Why is this the case? no it makes no sense, add tables and wanted result, which would make everything much clearer, How Intuit democratizes AI development across teams through reusability. SQL has an ability to nest queries within one another. Is it plausible for constructed languages to be used to affect thought and control or mold people towards desired outcomes? = Its like a series of IF ELSE. Although, here is your script, written corectly: although you could just use coalesce as Joe suggested. how do i incorporate a nested if statement in a select clause of a sql query? This Boolean_Expressions: Boolean_Expression_1, Boolean_Expression_2, evaluates the TRUE/FALSE condition for each WHEN Statement. We will show you how to do it. Ben. And tl.entity_id = wi.entity_id AND cs.name LIKE %||:P835_STATE||% The database will evaluate the first condition, then compare it to the expression, then evaluate the second condition, then evaluate that to the expression, and so on. I didnt need to this is not displayed and the name is already specified for the Continent column. If you want to use the alias (the AS prod part) in the GROUP BY, you cant do this in the same query. Connect and share knowledge within a single location that is structured and easy to search. However, if youre reaching the limit of 255 expressions, I would be looking at the efficiency of the query itself, as most queries should not need 255 expressions. CASE Statements. SELECT ITEM ,DETAIL_LEVEL_DESC AS DESCRIPTION ,COMP_DETAIL_ID AS PROMO_ID ,CASE WHEN CHANGE_TYPE = 'N' THEN CASE WHEN INSTR (UPPER (DETAIL_LEVEL_DESC), 'S/P')!=0 THEN 'SPP' Although not required, it is a good idea to have a Case Else statement in your Select Case block to handle unforeseen testexpression values. Azure Synapse Analytics I'm just looking conceptually at referencing the CASE statement in the SELECT clause somewhere in the WHERE clause, or vice versa. The answer provided by Joe Stefanelli is already correct. If ELSE is not present and Case_Expression matches with none of the values, then. The CASE statement is SQL's way of handling if/then logic. The region and polygon don't match. The CASE statementallows you to perform an IF-THEN-ELSE check within an SQL statement. 163 The following example uses the CASE expression in an UPDATE statement to determine the value that is set for the column VacationHours for employees with SalariedFlag set to 0. How can I explain to my manager that a project he wishes to undertake cannot be performed by the team? Below Diagram illustrate the execution flow of Simple Case. Msg 125, Level 15, State 4, Line 1. CASE Statement Frequently Asked Questions, Procedural Languages Have an IF Statement, The initial expression in a simple CASE statement. How do I perform an IFTHEN in an SQL SELECT? EXISTS The EXISTS keyword produces a Boolean value [TRUE/FALSE]. Its a common feature of many programming languages. END Continent sql statement, Incorrect syntax near update Select Case @location When 'MediaFiles' Then update tblMediaFiles set mdActive=1 When 'MediaFiles1' Then. SELECT first_name, last_name, country, input_expression is any valid expression. expr: Any expression for which comparison is defined. However, this is an optional part of the SQL CASE statement. [ELSE statement_list] END CASE Thank you very much for your effort on this topic. SQL Writing CASE WHEN Statements in SQL (IF/THEN) Becoming a Data Scientist 14.3K subscribers Subscribe 55K views 3 years ago Step-by-step tutorial shows you how to use the CASE WHEN. WHERE ( Theoretically Correct vs Practical Notation. It comes in two formats: simple case search case Simple SQL CASE Yes, you can use an SQL CASE in a WHERE clause. I have written a NESTED CASE statement in a SQL but when try running it, I'm getting the error as "missing keyword" Can someone help me in correcting this? Hopefully my SQL query will clear up what I'm trying to do: OR just do it in that way without subquery. If no conditions are true, it returns the value in the ELSE clause. current_page_url not ilike %prepaid/checkout%) THEN Staging Ground Beta 1 Recap, and Reviewers needed for Beta 2. I have a nested Case statement within a where clause with multiple whens that errors on the first case. rev2023.3.3.43278. Afterwards I illustrate the functionality using a practical example. Making statements based on opinion; back them up with references or personal experience. In the first form of CASE, each condition is an expression that should evaluate to a BOOLEAN value (True, False, or NULL). Assumption: Assume that we have the table as Guru99 with two columns and four rows as displayed below: We will use Guru99 table in further examples, Query 1: SIMPLE CASE with the NO ELSE option. I will explain this statement in detail. t_sm_service_master sm, Select statement to find duplicates on certain fields, Calculate proper rate within CASE statement. I want to document every case where in my "Status_W1" column it says "Not Trial+" and where my "Status_Now" column says "Trial+". Returns the result_expression of the first input_expression = when_expression that evaluates to TRUE. This example shows what happens if there are records that match with multiple WHEN expressions. where dt between 2018-06-15 and 2018-07-17 How Intuit democratizes AI development across teams through reusability. group by prod,purchase_flag or :P835_STATE=% SELECT columns, prod Good question. and cs.name like %||:P835_STATE||%) SQL HOME SQL Intro SQL Syntax SQL Select SQL Select Distinct SQL Where SQL And, Or, Not SQL Order By SQL Insert Into SQL Null Values SQL Update SQL Delete SQL Select Top SQL Min and Max SQL Count, Avg, Sum SQL Like SQL Wildcards SQL In SQL Between SQL Aliases SQL Joins SQL Inner Join SQL Left Join SQL Right Join SQL Full Join SQL Self Join SQL . ( WHEN NULL THEN value is null Appreciate your help with this. Race. You tell the database everything you want, and it returns a set of results. How can I explain to my manager that a project he wishes to undertake cannot be performed by the team? If thats the message youre getting, which column does it say does not exist? If no conditions are true, it will return the value in the ELSE clause. So, once a condition is true, it will stop To elaborate more, consider below example: Lets consider categorizing Condition and Action separately from the above example below: In the above example, we can see that the outcome of the different conditions is governing separate action. group by to_char(dldate,YYYY-MM))) d I think the AVG function and the COUNT might make it impossible. INNER JOIN item_class_data ic ON g.itcl_id = ic.id ON PA.IDCUENTAFACTURACION = CF.IDCUENTAFACTURACION Get my book: Beginning Oracle SQL for Oracle Database 18c, Copyright 2023 Database Star | Powered by Astra WordPress Theme. Statements that include a subquery usually take one of these forms: Check for more subquery rules and subquery types. and wi.wallet_type = 1 This happens for both Simple and Searched expressions. Staging Ground Beta 1 Recap, and Reviewers needed for Beta 2. how to get the distinct records based on maximum date? Is there a possibility to format the column alias? And I had never used UNPIVOT. (CASE error (incorrect syntax near CASE, expecting ( or SELECT) ORDER BY first_name, last_name; then the so called the column alias Continent is truncated to Con. In some situations, an expression is evaluated before a CASE expression receives the results of the expression as its input. Asking for help, clarification, or responding to other answers. ( A girl said this after she killed a demon and saved MC). THEN ARMY Is it a bug? "We, who've been connected by blood to Prussia's throne and people since Dppel". CASE country Is it a bug? A subquery is a SELECT statement that is nested within another SELECT statement and which return intermediate results. The data types of input_expression and each when_expression must be the same or must be an implicit conversion. When expression2 Then Result2. union all We can write this code using SQL IIF statement syntax as following. CASE clause uses a rule to return a specific result based on the specified condition, similar to if/else statements in other programming languages. I'm sure it's probably pretty simple but can't see what's wrong. GROUP BY prod; The GROUP BY is outside the subquery so it should work. ELSE NULL This article applies to Oracle, SQL Server, MySQL, and PostgreSQL. FROM ( Is there a proper earth ground point in this switch box? New to PL/SQL in Oracle9 i, the CASE statement allows you to select one sequence of statements to execute out of many possible sequences. THEN ACT select ename, job, sal, case -- Outer Case when ename like 'A%' then case when sal >= 1500 then 'A' -- Nested Case end when ename like 'J%' then case when sal >= 2900 then 'J' -- Nested Case end end as "Name-Grade" From Emp SELECT columms, Is it suspicious or odd to stand by the gate of a GA airport watching the planes? Is it suspicious or odd to stand by the gate of a GA airport watching the planes? Find centralized, trusted content and collaborate around the technologies you use most. Below is a selection from the "OrderDetails" table in the Northwind sample database: The following SQL goes through conditions and returns a value when the first condition is met: The following SQL will order the customers by City. order by 1. In Simple Case, VALUE exists for each WHEN statement. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, Since your THEN and your ELSE branch are equal, you can just get rid of the CASE. Both formats support an optional ELSE argument. reading and return the result. 101, 2. Does a summoned creature play immediately after being summoned by a ready action? WHEN USA THEN 1 Unlike the simple case, Searched Case is not restricted to only equality check but allows Boolean expression. group by to_char(dldate,YYYY-MM))) d Below is the execution approach: If Case_Expression is equivalent to Value_1, then further WHENTHEN statements are skipped, and CASE execution will END immediately. >>I'm having trouble getting a CASE statement to work in a nested select.<< What trouble do you have? and our Is there a proper earth ground point in this switch box? THEN NG first_name, last_name, country, Does a barbarian benefit from the fast movement ability while wearing medium armor? WHEN NULL THEN There are two types of Case Statements, and they are: Is it suspicious or odd to stand by the gate of a GA airport watching the planes? In Searched Case, Boolean_Expression exists for each WHEN statement. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. WHEN UK THEN 3 and Case else_result_expression is any valid expression. But Im pretty sure I am only giving one value per WHEN/THEN statement. For example, the following query produces a divide by zero error when producing the value of the MAX aggregate. union all and (exists (select x from CELL_STATES cs where cs.cell_id=g.cell_id By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. If no Boolean_expression evaluates to TRUE, the Database Engine returns the else_result_expression if an ELSE clause is specified, or a NULL value if no ELSE clause is specified. The examples below will show how this is done. It takes about 95 seconds to load on my machine. ELSE 0 END as Qty. Also, the keyword ilike should be like to use wildcard searches. I am trying to select only certain columns from a table but need to read in these columns based on conditions of other columns that I DON'T want to include in the final output - if that makes any sense. CASE is used to specify a result when there are multiple conditions. THEN DEP Tutorial_name = SQL, is evaluated for TRUE/FALSE until first Boolean expression which evaluates to TRUE. Depending upon Flight ticket value, one amongst the following result will be displayed: We can use CASE inside CASE in SQL. Azure SQL Managed Instance (in the example above, the case results are captured as prod ). If this argument is omitted and no comparison operation evaluates to TRUE, CASE returns NULL. HOW TO: Select MAX(T2.Id) of T2 for a given value T2.Value? The CASE expression is a conditional expression, similar to if/then/else statements found in other languages. ELSE Fixed_Others END) END AS TELEFONO, Am I missing something? Case keyword is followed by the WHEN statement, and there is no expression between CASE and WHEN. This EXISTS checks the existence of the rows returned by the sub query. current_page_url ilike %optus.com.au/shop/deals-bundles% OR How to show that an expression of a finite type must be one of the finitely many possible values? SQL until Tutorial_name matches with WHEN values. INNER JOIN A001470.INDIVIDUO I ON ICF.IDINDIVIDUO = I.IDINDIVIDUO SUM(count_topo) AS count_topo, CASE WHEN MOD(yourcolumn, 2)=0 THEN yourcolumn ELSE null END AS evenvalue, Ob Long; Position; Hacker Database. When subtracting 10 hours from VacationHours results in a negative value, VacationHours is increased by 40 hours; otherwise, VacationHours is increased by 20 hours. ELSE 0 END as Qty. CASE NUMEROTELEFONO 103, 3. The data types of else_result_expression and any result_expression must be the same or must be an implicit conversion. Welcome to the eighth installment of this SAP HANA SQL Scripts core concepts section where we learn how to pick up different data for the same field when provided with unique conditions with SQL CASE statement. The examples below will show how this is done. E.g. The CASE expression in the SET statement determines the value to display for the column ContactType based on the existence of the BusinessEntityID column in the Employee, Vendor, or Customer tables. count(distinct(vid||active_session)), SELECT TO_CHAR(g.dldate,YYYY-MM) AS dl_month, CASE WHEN Col1 = 1 OR Col3 = 1 THEN 1 WHEN Col1 = 2 THEN 2 . The CASE statement allows you to perform an IF-THEN-ELSE check within an SQL statement. CASE There is nothing wrong with a case within a case. The simple CASE expression operates by comparing the first expression to the expression in each WHEN clause for equivalency. If you preorder a special airline meal (e.g. User-864238592 posted. We can nest CASE statements similar to nested ifs that we find in most programming languages. I think you need to add some selects before your sum subqueries. AND ( Thats strange the second CASE is being ignored. (select 4 seq,trunc(avg(count)) Avg from (select to_char(dldate,YYYY-MM), count(*) count
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