How to use sql*plus built-in timers?

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What is the purpose of normalization?

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How to get list of all tables from a database?

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What is embedded sql what are its advantages?

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What does pragma mean?

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Is sql injection illegal?

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what is switch column,colums cost in oracle?

0 Answers   Metric Stream,

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What is a table partition?

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What are the pre requisites?

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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Why schema is used in sql?

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Why does %isopen return false for an implicit cursor?

1 Answers  

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