Most tables have a primary key to comply with the standards of normalization of tables.
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Q15: Although CHECK constraints can check multiple conditions,it
Q16: A table can have multiple PRIMARY KEY
Q17: Triggers are at the database level and
Q18: Constraints are enabled by default when you
Q19: Naming constraints is mandatory.
Q21: CHECK constraints cannot contain queries or any
Q22: A(n)_ constraint appears immediately next to the
Q23: By default,the initial value of a sequence
Q24: The _ constraint is similar to the
Q25: You can use ALTER INDEX to change
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