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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.
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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;
28 lut 2023 · CASE w SQL możemy wykonać na dwa sposoby. Poniżej przedstawiam schematy działania instrukcji. Pierwsza konstrukcja CASE polega na przypisaniu wyniku do wartości. CASE wartość_lub_nazwa_kolumny. WHEN wartość_1 THEN wynik_1 . WHEN wartość_2 THEN wynik_2 . WHEN wartość_n THEN wynik_n . [ ELSE wynik_gdy_zaden_z_warunków_nie_jest_spełniony ] END.
If no input_expression = when_expression evaluates to TRUE, the SQL Server Database Engine returns the else_result_expression if an ELSE clause is specified, or a NULL value if no ELSE clause is specified.
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 CASE statement returns the result_1, result_2, or result_3 if the expression matches the corresponding expression in the WHEN clause. If the expression does not match any expression in the WHEN clause, it returns the esle_result in the ELSE clause. The ELSE clause is optional.
16 sty 2024 · SELECT column_name, CASE WHEN condition THEN result ELSE alternative_result END AS new_column FROM your_table; Let's break down the conditions: WHEN condition THEN result : Defines the primary condition to be checked and the corresponding result to be assigned if the condition is met.
