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並前往https://www.postgresql.org/docs/7.4/functions-conditional.html

Documentation: 7.4: Conditional Expressions - PostgreSQL

The SQL CASE expression is a generic conditional expression, ... SELECT * FROM test; a --- 1 2 3 SELECT a, CASE WHEN a=1 THEN 'one' WHEN a=2 THEN 'two' ELSE ...

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