多选题Which three statements correctly describe the functions and use of constraints? （）AConstraints provide data independence.BConstraints make complex queries easy.CConstraints enforce rules at the view level.DConstraints enforce rules at the table level.EConstraints prevent the deletion of a table if there are dependencies.FConstraints prevent the deletion of an index if there are dependencies.
多选题
Which three statements correctly describe the functions and use of constraints? （）
A
Constraints provide data independence.
B
Constraints make complex queries easy.
C
Constraints enforce rules at the view level.
D
Constraints enforce rules at the table level.
E
Constraints prevent the deletion of a table if there are dependencies.
F
Constraints prevent the deletion of an index if there are dependencies.
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