Postgresql: SQL script to get a list of all tables that have a particular column as foreign key
To quickly identify tables that have your target column as a foreign key, utilize this to-the-point script:
Remember, replace 'TargetTable' with the name of your specific table.
Unveiling information_schema secrets
The information_schema can prove to be quite the beacon when shining a light on foreign key relationships. By deploying these specific views—table_constraints, referential_constraints, and key_column_usage, and explicitly detailing them to our needs, we engage in accurate, effective querying:
Simply replace 'TargetColumn' with your desired column name.
Focusing the lens
When dealing with vast databases that span multiple schemas, it becomes necessary to adjust our focus. The accuracy of our results can be improved by applying more precise constraints. Let's look at the enhanced sequence:
Just replace 'TargetTable' and 'TargetSchema' to suit your database.
Constraints: Their unique story
Unique constraints in one table are often the targets for foreign keys in another. Identifying these relationships can prevent unforeseen data model alterations that could violate dependencies.
Merging our tools for precision
When locating dependencies across schemas or excluding particular namespaces, merging our SQL tools proves beneficial. Here's how to combine these elements:
This master query searches for all foreign keys across all schemas that point to your targeted column and table, giving you a complete understanding of your database structure.
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