Best answer: How do you write a case in SQL query?

How do I add a case to a query?

Case Statement with Order by clause

  1. Select EmployeeName,Gender,Salary.
  2. from Employee.
  3. ORDER BY CASE Gender.
  4. WHEN ‘F’ THEN Salary End DESC,
  5. Case WHEN Gender=’M’ THEN Salary.
  6. END.

Can we use and in case statement in SQL?

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 . This includes stringing together multiple conditional statements using AND and OR .

How do you write two conditions in a case statement in SQL?

Here are 3 different ways to apply a case statement using SQL:

  1. (1) For a single condition: CASE WHEN condition_1 THEN result_1 ELSE result_2 END AS new_field_name.
  2. (2) For multiple conditions using AND: CASE WHEN condition_1 AND condition_2 THEN result_1 ELSE result_2 END AS new_field_name.

HOW DO CASE statements work?

The CASE statement chooses from a sequence of conditions, and executes a corresponding statement. The CASE statement evaluates a single expression and compares it against several potential values, or evaluates multiple Boolean expressions and chooses the first one that is TRUE .

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Can I use case in where clause SQL Server?

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.

What does case do in SQL?

The SQL CASE Statement

The CASE statement goes through conditions and returns a value when the first condition is met (like an if-then-else statement). So, once a condition is true, it will stop reading and return the result.

How do you do not in SQL?

Overview. The SQL Server NOT IN operator is used to replace a group of arguments using the <> (or !=) operator that are combined with an AND. It can make code easier to read and understand for SELECT, UPDATE or DELETE SQL commands.

How many tables can be join in SQL query?

Theoretically, there is no upper limit on the number of tables that can be joined using a SELECT statement. (One join condition always combines two tables!) However, the Database Engine has an implementation restriction: the maximum number of tables that can be joined in a SELECT statement is 64.

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).

Can we use CASE statement in where clause?

You can use a CASE Statement anywhere a valid expression is used within the SELECT statement such as the WHERE clause’s filter criteria.

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