POSTGRESQL CONSTRAINT HOW TO
POSTGRESQL CONSTRAINT UPDATE

DO UPDATE: This tells PostgreSQL that you want to update the row that is already in the table.

In essence, this action makes no changes, but suppresses the error that would normally occur if you tried to insert a row that violates a condition.

DO NOTHING: Tells PostgreSQL to leave the conflicting record as-is.

The specified can be one of the following: The companion item will define what PostgreSQL should do if a conflict arises.

The name of a unique constraint: ON CONSTRAINT.

The name of a specific column or columns: (column1).

In this context, the specifies what conflict you want to define a policy for.

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POSTGRESQL CONSTRAINT HOW TO

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Postgresql constraint