sql: support ON DELETE SET NULL on foreign key constraints · Issue #17803 · cockroachdb/cockroach · GitHub
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SET NULL on delete foreign key not available even when column is nullable · Issue #391 · TablePlus/TablePlus · GitHub
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DELETE CASCADE and UPDATE CASCADE in SQL Server foreign key
SOLVED: Which of the following actions cannot be specified as part of the foreign key constraint regarding the deletion of tuples from the referencing relation: ON DELETE CASCADE ON DELETE SET NULL
DELETE CASCADE and UPDATE CASCADE in SQL Server foreign key
mysql - How can I make a foreign key with On Delete = Set Null? - Stack Overflow
