How do I use multiple case statements in SQL?

Can you have 2 CASE statements in SQL?

There are two types of CASE statement, SIMPLE and SEARCHED. You cannot evaluate multiple expressions in a Simple case expression, which is what you were attempting to do.

How do you write a multiple case statement in SQL query?

You can get a nearly identical runtime and query plan by writing the query like this: SELECT (case A. column1 when ‘1’ then (select value from B where B. clientId=100 and ‘1’=B.Id) when ‘2’ then (select value from C where C.

How do you use multiple values in a case statement?

SQL:2003 standard allows to define multiple values for simple case expression: SELECT CASE c. Number WHEN ‘1121231’,’31242323′ THEN 1 WHEN ‘234523’,’2342423′ THEN 2 END AS Test FROM tblClient c; It is optional feature: Comma-separated predicates in simple CASE expression“ (F263).

How do you combine two cases in SQL?

There are two ways to work with multiple queries: combine their results.

The “searched” CASE expression:

  1. CASE.
  2. WHEN <boolean expression> THEN <result expression>
  3. [ WHEN <boolean expression> THEN <result expression> ] …
  4. [ ELSE <result expression>
  5. END.
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What can I use instead of case in SQL?

Question: What is Alternative to CASE Statement in SQL Server? Answer: IIF Function.

Where do you put case statements in SQL?

According to MS SQL Docs, a CASE statement can be used throughout the SELECT statement. CASE can be used in any statement or clause that allows a valid expression. For example, you can use CASE in statements such as SELECT, UPDATE, DELETE and SET, and in clauses such as select_list, IN, WHERE, ORDER BY, and HAVING.

How do you write a case statement in SQL query?

SQL CASE Statement

  1. CASE. WHEN condition1 THEN result1. WHEN condition2 THEN result2. WHEN conditionN THEN resultN. ELSE result. …
  2. Example. SELECT OrderID, Quantity, CASE. WHEN Quantity > 30 THEN ‘The quantity is greater than 30’ …
  3. Example. SELECT CustomerName, City, Country. FROM Customers. ORDER BY.

Can we write case inside case in SQL?

Nested CASE: CASE in IF ELSE

In the above example CASE is NESTED inside IF…ELSE statement: First, IF Statement will execute and if Case Condition in SQL server is False then ELSE statement will execute. Else contain Nested CASE Statement in SQL inside it.

How do I add an IF condition in SQL query?

You can use CASE to implement IF-THEN-ELSE in PL/SQL – this is just an example: select case field1 WHEN ‘1’ THEN ‘VALUE1’ WHEN ‘2’ THEN ‘VALUE2’ ELSE ‘VALUEOTHER’ END, case field2 WHEN ‘1’ THEN ‘VALUE1’ WHEN ‘2’ THEN ‘VALUE2’ ELSE ‘VALUEOTHER’ END from ( select ‘1’ “FIELD1”, ‘2’ “FIELD2” from dual );

Can CASE statement return multiple values?

Of course I can write the case condition multiple times, each time return one value.

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Can you use a select statement in a case statement?

The case statement in SQL returns a value on a specified condition. We can use a Case statement in select queries along with Where, Order By, and Group By clause.

Can we use case without select statement?

3 Answers. You can use a WHERE clause to restrict the output. Or if you wanted to showcase some other value instead of null use an else part inside the CASE statement.

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