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Search options not deleted user 207204

A core statement in SQL that does what it says on the tin: inserts data into a table.

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How to check other table for value during insert

In PostgreSQL is it possible to check another table's data to see if there is data that fits a certain condition during an INSERT statement? … I have attempted to use WHERE NOT EXISTS as I want to not go on with the INSERT if I don't find the data I'm looking for in another table but I get the following error: Database Model Query INSERT