Answer / Azeen Zehra Naqvi

A trigger is a SQL statement that automatically runs in response to certain events such as insert, update, or delete on a specific table. Triggers help maintain the integrity of the database and are used for auditing purposes and enforcing business rules.

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how to find the second highest salary from emp table?

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Mention what does the hierarchical profiler does?

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i have table T!. A B C D NULL 1 2 3 4 NULL 5 6 7 8 NULL 9 10 11 12 NULL. I WANT COUNT OF NULL VALUES IN TABLE. WRITE A QUERY.

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What is the diff between Truncate table / delete <table name> purge

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