TLDR; I would like to get a warning on changing/adding a foreign key for Postgresql that it locks the table and if the table is large, it could be locked for some time. When adding or changing a ...
In #PostgreSQL, NULL values are treated as distinct when enforcing unique constraints, meaning multiple NULL values are allowed in a column with a unique constraint. #PostgreSQLPerformance @MinervaDB ...
It should be noted that a check constraint (PostgreSQL) is satisfied if the check expression evaluates to true or the null value. why is the check constraint satisfied even if the result is null.
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