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並前往https://dba.stackexchange.com/questions/271296/in-a-postgres-function-how-to-skip-expressions-if-input-value-is-null

In a Postgres function, how to skip expressions if input value is ...

The usual way to deal with that are conditions like this: where (city is null or addresses ->> 'city' = city) and (state is null or ...

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