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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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MySQL CASE expression is a control flow structure that allows you to add if-else logic to a query. Generally speaking, you can use the CASE expression anywhere that allows a valid expression e.g., SELECT, WHERE and ORDER BY clauses. The CASE expression has two forms: simple CASE and searched CASE.
For the first syntax, case_value is an expression. This value is compared to the when_value expression in each WHEN clause until one of them is equal. When an equal when_value is found, the corresponding THEN clause statement_list executes.
The following is the basic syntax of the simple CASE statement: CASE case_value WHEN when_value1 THEN statements WHEN when_value2 THEN statements ... [ELSE else-statements] END CASE; Code language: SQL (Structured Query Language) (sql)
26 sty 2024 · This guide aims to walk you through the nuts and bolts of using CASE-WHEN statements in MySQL 8 through practical examples and scenarios, enhancing both simple and complex querying tasks. Basic CASE-WHEN Syntax. The CASE statement in MySQL acts like an IF-THEN-ELSE statement found in many programming languages. Its simplest form looks like this:
7 mar 2013 · Syntax: CASE WHEN search_condition THEN statement_list [WHEN search_condition THEN statement_list].... [ELSE statement_list] END CASE Implementation:
Syntax. The basic syntax of the CASE statement looks like this: CASE. WHEN condition1 THEN result1. WHEN condition2 THEN result2. ... ELSE default_result. END. Here’s a breakdown of the components: CASE: The keyword that starts the CASE statement.
