Which certification is best for sql?

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write an sql query to get third maximum salary of an employee from a table named employee_table. : Sql dba

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Why is nosql good?

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Sql technical questions

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what is ref cursor in pl/sql?

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What is the main difference between a UNION statement and a UNION ALL statement? 1. A UNION statement eliminates duplicate rows; a UNION ALL statement includes duplicate rows. 2. A UNION statement can be used to combine any number of queries; a UNION ALL statement can be used to combine a maximum of two queries. 3. A UNION statement can only combine queries that have parallel fields in the SELECT list; a UNION ALL statement can combine queries with differing SELECT list structures. 4. A UNION statement cannot be used with aggregate functions; a UNION ALL statement can be used with aggregate functions. 5. There is no difference between the two statements; they are interchangeable.

2 Answers   Saman Bank, Sonata,

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What are the two types of exceptions in pl/sql?

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Is microsoft sql free?

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Explain spool.

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how to decrement dates by 1 in mysql? : Sql dba

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How will you a activate/deactivate integrity constraints?

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How many commands are there in sql?

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