Disable All constraints, Delete data in all tables and Enable all constraints Commands 


Disable all constraints
EXEC sp_msforeachtable "ALTER TABLE ? NOCHECK CONSTRAINT all"

Delete data in all tables
EXEC sp_MSForEachTable "DELETE FROM ?"

Enable all constraints
exec sp_msforeachtable "ALTER TABLE ? WITH CHECK CHECK CONSTRAINT all"
if some of the tables have identity columns we may want to reseed them
EXEC sp_MSforeachtable "DBCC CHECKIDENT ( '?', RESEED, 0)"

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