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What is the difference of unique and PK?

5th Sep 2016, 5:07 PM
Sjardi Djoy Willems
Sjardi Djoy Willems - avatar
2 ответов
+ 2
unique key can have null value. and a table can have only one pk
10th Sep 2016, 6:04 PM
Natalya Shtikel
Natalya Shtikel - avatar
0
Your table can contain a few unique columns, but Primary Key must be only one.
16th Sep 2016, 1:54 PM
Denis Shtyrov