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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.
24 mar 2021 · CASE WHEN, IF, IFNULL, NULLIF – funkcje warunkowe mySQL – Kurs języka SQL. Napisano 24 marca 2021 przez Damian Jeliński. W poniższym kursie omówię zastosowanie instrukcji warunkowych (CASE WHEN, IF, IFNULL, NULLIF) używanych w języku mySQL wraz z przykładami.
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.
Learn how to use the CASE statement in MySQL to perform conditional logic within SQL queries. See syntax, examples, and applications of the CASE statement in various clauses and functions.
This MySQL tutorial explains how to use the MySQL CASE function with syntax and examples. The MySQL CASE function has the functionality of an IF-THEN-ELSE statement by allowing you to evaluate conditions and return a value when the first condition is met.
Learn how to use the CASE function in MySQL to perform conditional logic and return different values based on specified conditions. See syntax, examples, and nested CASE statements.
