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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:...
- Try It Yourself
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.
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.
This tutorial shows you how to use the MySQL CASE statements, including simple CASE and searched CASE statement, in stored procedures.
30 sie 2024 · The CASE WHEN statement in MySQL allows you to evaluate a list of conditions and return one of several possible result expressions. It is often used in SELECT statements to modify the output based on specific conditions, making it a versatile tool in data retrieval and manipulation.
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.
CASE: The keyword that starts the CASE statement. WHEN condition THEN result: Evaluates the specified condition and returns the corresponding result if the condition is true. ELSE: An optional keyword that provides a default result if none of the preceding conditions are true.
