The UNIQUE constraint ensures that all values in a column are different. Both the UNIQUE and PRIMARY KEY constraints provide a guarantee for uniqueness for a column or set of columns. A PRIMARY KEY constraint automatically has a UNIQUE constraint. However, you can have many UNIQUE constraints per table, but only one PRIMARY KEY constraint […]
Tag: constraint
Book Suggestions: The Goal & The Phoenix Project
In this intriguing business novel, which illustrates state-of-the-art economic theory, Alex Rogo is a UniCo plant manager whose factory and marriage are failing. To revitalize the plant, he follows piecemeal advice from an elusive former college professor who teaches, for example, that reduction in the efficiency of some plant operations may make the entire operation […]
Drop all the tables, stored procedures, triggers, constraints and all the dependencies in one sql statement
These 2 scripts clean all views, SPS, functions PKs, FKs and tables. 1. The First script by Adam Anderson, updated to support objects in other schemas than dbo: — check constraints select @stmt = isnull( @stmt + @n, ” ) + ‘alter table [‘ + schema_name(schema_id) + ‘].[‘ + object_name( parent_object_id ) + ‘] drop […]
Add Constraint to SQL Table to ensure email contains @
You can check the code below: