Can we use CASE statement in SELECT query?

Posted on by Muna Meyer

Can we use CASE statement in SELECT query?

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. It can be used in the Insert statement as well.

How do you SELECT a case statement in SQL?

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. (CASE.

How do you write a CASE in SELECT?

Using a SELECT statement with a simple CASE expression Within a SELECT statement, a simple CASE expression allows for only an equality check; no other comparisons are made. The following example uses the CASE expression to change the display of product line categories to make them more understandable.

How do I add a case statement to a SELECT clause?

The CASE statement always goes in the SELECT clause. CASE must include the following components: WHEN , THEN , and END . ELSE is an optional component. You can make any conditional statement using any conditional operator (like WHERE ) between WHEN and THEN .

Can we use case in where clause in SQL?

CASE STATEMENT IN WHERE CLAUSE: We can use a case statement in Where, Order by and Group by clause. So, by using a CASE statement with the where condition displays the result.

How do you write a case statement in SQL Server?

SQL Server CASE statement syntax It starts with the CASE keyword followed by the WHEN keyword and then the CONDITION. The condition can be any valid SQL Server expression which returns a boolean value. For instance, the condition can be model > 2000, the THEN clause is used after the CONDITION.

What is a CASE expression?

A CASE expression returns a value. CASE expression has two formats: This format compares a value expression to a set of value expressions to determine a result. The value expressions are evaluated in their order listed. If a value expression evaluates to TRUE, CASE returns the value expression for the THEN clause.

What can I use instead of CASE in SQL?

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

Can we write case in WHERE clause?

Can a case statement be a join?

There are plenty of ways to resolve for this: a subquery with a CASE statement in the join statement for the table you are joining in, a CASE statement in a temp table where all values are changed to match, or this handy little trick of using a CASE statement in the JOIN’s ON clause.