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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.
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The Try-MySQL Editor at w3schools.com MySQL Database:...
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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.
22 gru 2011 · CASE value WHEN [compare_value] THEN result [WHEN [compare_value] THEN result ...] [ELSE result] END Alternative: CASE WHEN [condition] THEN result [WHEN [condition] THEN result ...]
23 kwi 2024 · The CASE Function in MySQL allows using conditional logic within the queries. It evaluates the conditions and returns a value when a condition is met (like an if-then-else statement). It can be used with different statements like SELECT, WHERE, and ORDER BY clause based on its use and requirements. Some features of MySQL CASE function are shown ...
26 sty 2024 · The CASE-WHEN statement in MySQL 8 is a robust tool for building dynamic and responsive SQL queries. Varying from basic conditional output to more complex evaluations involving subqueries and joins, CASE-WHEN can help you derive nuanced insights from your data in an elegant fashion.
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.
This tutorial shows you how to use the MySQL CASE statements, including simple CASE and searched CASE statement, in stored procedures.
