Is a foreign key always unique?
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Is sql microsoft?
Which sorts rows in sql?
I have a small PL/SQL Block assume in this way begin select * from emp where empno=100; exception when others then <Some Messages> when no_data_found then <Some Messages> when too_many_rows then <Some Messages> end; The question which he asked was whether this block will get executed normally or it will throw error ? If errored out then what is the reason for the error ? Could anybody please help me ? Regards Nakul Venkataraman
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What is the difference between UNIQUE CONSTRAINT and PRIMARY KEY? 1. There is no difference. 2. A PRIMARY KEY cannot be declared on multiple columns. 3. A UNIQUE CONSTRAINT cannot be declared on multiple columns. 4. A table can have multiple PRIMARY KEYS but only one UNIQUE CONSTRAINT. 5. A table can have multiple UNIQUE CONSTRAINTs but only one PRIMARY KEY.
what is switch column,colums cost in oracle?
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