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Definition and Usage. The CASE statement goes through conditions and return 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 will return the value in the ELSE clause.
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In this tutorial, you will learn how to use the MySQL CASE expression to add if-else logic to SELECT, WHERE, and ORDER BY of a query.
There is also a CASE operator, which differs from the CASE statement described here. See Section 14.5, “Flow Control Functions”. The CASE statement cannot have an ELSE NULL clause, and it is terminated with END CASE instead of END. For the first syntax, case_value is an expression.
The MySQL CASE function is a powerful tool used for conditional logic within SQL queries. It allows you to perform conditional operations based on specified conditions and return different values depending on whether the conditions are met or not.
This MySQL tutorial explains how to use the MySQL CASE function with syntax and examples. The MySQL CASE function has the functionality of an IF-THEN-ELSE statement by allowing you to evaluate conditions and return a value when the first condition is met.
NULLIF (expr1,expr2) Returns NULL if expr1 = expr2 is true, otherwise returns expr1. This is the same as CASE WHEN expr1 = expr2 THEN NULL ELSE expr1 END. The return value has the same type as the first argument. mysql> SELECT NULLIF (1,1); -> NULL mysql> SELECT NULLIF (1,2); -> 1. Note.
In MySQL, the CASE statement is a powerful conditional expression that allows you to perform conditional logic within SQL queries. It provides a way to perform different actions based on different conditions, similar to the IF-THEN-ELSE structure in other programming languages.
