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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.
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.
5 maj 2015 · From the manual, it looks like the if function is just a less flexible form of the case expression. For example, you could write: select if(username = 'darxysaq', 'high', 'low') as awesomeness And the equivalent with case: select case when username = 'darxysaq' then 'high' else 'low' end as awesomeness But case is more flexible. It allows more ...
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.
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.
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.
This tutorial shows you how to use the MySQL CASE statements, including simple CASE and searched CASE statement, in stored procedures.
