What are the types of queries in sql?

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What are the uses of merge?

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Can procedure in package be overloaded?

0 Answers   EXL,

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What is meant by user defined function?

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Can you select everything, but 1 or 2 fields, without writer's cramp?

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in table there r so many rows write a query which two rows r updated last two day befor?

3 Answers   Exilant,

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Are subqueries faster than joins?

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What are pl/sql exceptions? Tell me any three.

1 Answers  

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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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how can you create an empty table from an existing table? : Sql dba

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What are stored procedures in mysql?

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How to get each name only once from an employee table?

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