Useful tips

How do you write a case statement in SQL query?

How do you write a case statement in SQL 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.

What is CASE expression in SQL?

The CASE expression has two formats: The simple CASE expression compares an expression to a set of simple expressions to determine the result. The searched CASE expression evaluates a set of Boolean expressions to determine the result.

How do you write an if statement in SQL?

Example 1: IF Statement with a numeric value in a Boolean expression

  1. IF(1 = 1)
  2. PRINT ‘Executed the statement as condition is TRUE’;
  3. ELSE.
  4. PRINT ‘Executed the statement as condition is FALSE’;

How do you use a 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. If no conditions are true, it returns the value in the ELSE clause.

How do you end a case statement?

The CASE statement ends with an END keyword.

How do you use a case statement?

Can you use or in SQL?

The OR condition can be used in the SQL UPDATE statement to test for multiple conditions. This example would update all favorite_website values in the customers table to techonthenet.com where the customer_id is 5000 or the last_name is Reynolds or the first_name is Paige.

How does case work 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. If no conditions are true, it returns the value in the ELSE clause.

What is use of with in SQL?

The SQL WITH clause allows you to give a sub-query block a name (a process also called sub-query refactoring), which can be referenced in several places within the main SQL query.

What is a case when statement in SQL?

CASE is the special scalar expression or conditional statement in the SQL language which returns a single value based on the evaluation of a statement. It can be used in Select, Where and Order By clause. A Case expression is mostly used in SQL stored procedures or as a formula for a particular column, which optimizes the SQL statements.

What is a case function in SQL?

Case Function. Case function execute a sequence of statement depending upon condition. CASE function in SQL operates by comparing the first expression to the expression in each WHEN clause for equivalency. Expressions which are equivalent in Case function, expression in the THEN clause will be executed.

What is case in Oracle SQL?

PLSQL CASE statement has the functionality of an IF-THEN-ELSE statement.

  • 2 …
  • etc.
  • Note.
  • Applies To
  • Example.
  • Frequently Asked Questions.

    • What is a SELECT CASE statement?

    A Select Case statement allows a variable to be tested for equality against a list of values. Each value is called a case, and the variable being switched on is checked for each select case.