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Learn how to use the SQL CASE expression to check conditions and return values like an if-then-else statement. See syntax, examples and a demo database with the Northwind sample data.
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CASE WHEN Quantity > 30 THEN 'The quantity is greater than...
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SQL Statement: SELECT CustomerName, City, Country FROM...
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13 cze 2021 · Here are the CASE expression examples from the PostgreSQL docs (Postgres follows the SQL standard here): SELECT a, CASE WHEN a=1 THEN 'one' WHEN a=2 THEN 'two' ELSE 'other' END FROM test; or. SELECT a, CASE a WHEN 1 THEN 'one' WHEN 2 THEN 'two' ELSE 'other' END FROM test;
3 wrz 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.
The CASE expression compares an expression to a set of expression (when_expression_1, when_expression_2, when_expression_3, …) using the equality operator (=). If you want to use other comparison operators such as greater than (>), less than (<), etc., you use the searched CASE expression.
16 sty 2024 · Using the CASE expression, we can categorize transactions into meaningful groups, simplifying the analysis and allowing for a quick overview of transaction patterns.
2 cze 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
The simple CASE expression compares the input expression (input) to an expression (ei) in each WHEN clause for equality. If the input expression equals an expression ( ei ) in the WHEN clause, the result ( ri ) in the corresponding THEN clause is returned.
