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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.
CASE WHEN search_condition THEN statement_list [WHEN search_condition THEN statement_list] ... [ELSE statement_list ] END CASE The CASE statement for stored programs implements a complex conditional construct.
1 sie 2016 · Let's convert this if-else if chain in MySQL using CASE WHEN expression: SET @n := -9; SELECT CASE WHEN @n <0 THEN 'N is Negative' WHEN @n =0 THEN 'N is 0' ELSE 'N is positive' END AS output;
This tutorial shows you how to use the MySQL CASE statements, including simple CASE and searched CASE statement, in stored procedures.
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.
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 ...
