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Results tagged with unique-constraint
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user 290432
DDL UNIQUE constraints ensure that the data contained in a column, or a group of columns, is unique among all the rows in the table. The data contained in the column or columns involved is, therefore, useful to uniquely identify a row in the relevant table.
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Unique constraint for single structure that simulates relations between tables
Imagine I have several tables in SQL Server 2016:
Cat
Cat carrier
Cat transit box
Cat car
Every object can be stored in higher level, but not necessarily directly one above with N-to-1. So a cat can …
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