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The SQL CASE Expression. The CASE expression goes through conditions and returns 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 returns the value in the ELSE clause.
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The SQL CASE expression allows you to evaluate a list of conditions and returns one of the possible results. The CASE expression has two formats: simple CASE and searched CASE. You can use the CASE expression in a clause or statement that allows a valid expression.
3 Σεπ 2024 · CASE can be used in any statement or clause that allows a valid expression. For example, you can use CASE in statements such as SELECT, UPDATE, DELETE and SET, and in clauses such as <select_list>, IN, WHERE, ORDER BY, and HAVING. Transact-SQL syntax conventions.
13 Ιουν 2021 · 7 Answers. Sorted by: 82. The complete syntax depends on the database engine you're working with: For SQL Server: CASE case-expression. WHEN when-expression-1 THEN value-1. [ WHEN when-expression-n THEN value-n ... [ ELSE else-value ] END. or: CASE. WHEN boolean-when-expression-1 THEN value-1. [ WHEN boolean-when-expression-n THEN value-n ...
2 Ιουν 2023 · SQL CASE Statement Syntax. The syntax of the SQL CASE expression is: CASE [expression] WHEN condition_1 THEN result_1 WHEN condition_2 THEN result_2 ... WHEN condition_n THEN result_n ELSE result END case_name. The CASE statement can be written in a few ways, so let’s take a look at these parameters. Parameters of the CASE Statement
22 Αυγ 2024 · The CASE statement in SQL is a conditional expression that allows you to execute different logic based on certain conditions within a query. It is used to create new columns, customize values, or modify query outputs depending on specified criteria.
28 Ιουν 2023 · Here’s the general syntax for a simple case statement: CASE expression. WHEN value1 THEN result1. WHEN value2 THEN result2. ... ELSE default_result. END. With this syntax, if the expression matches value1, the result would be result1. If expression matches value2, the result would be result2, and so on.
