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Results tagged with unique-constraint
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user 277982
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.
2
votes
3
answers
604
views
Are unique filtered indexes considered an antipattern for enforcing constraints?
I have a table, such as the following. Let's called it Fools.
FoolID
FoolValue
IsActiveFoolValue
1
Ultra Foolish
0
1
Super Foolish
1
2
Quite Foolish
1
A business rule is that for each Fo …
- 855
1
vote
1
answer
95
views
Should unique filtered indexes include their filtering column?
Context
Suppose that you have a unique filtered index on a table. Said index exists only to enforce a constraint. A classic example of such an index would be one making sure that a non-nullable bit co …
- 855
3
votes
2
answers
455
views
Is there any benefit to declaring an index that contains a primary key as unique?
Suppose that I have a table with many columns that I don't care about, but two that I do: Primary and Secondary. There is a clustered primary key on Primary.
CREATE TABLE [dbo].[OnlyTwoGoodColumnsButM …
- 855