What is difference between UNIQUE constraint and PRIMARY KEY constraint?
Submitted by: AdministratorA column defined as UNIQUE can contain Nulls while a column defined as PRIMARY KEY can't contain Nulls. 47.What is Index Cluster? - A Cluster with an index on the Cluster Key 48.When does a Transaction end? - When it is committed or Rollbacked.
Submitted by: Administrator
Submitted by: Administrator
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