What are the different types of sql commands?

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What is pl/sql table? Why is it used?

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what happens when the column is set to auto increment and you reach the maximum value for that table? : Sql dba

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What is sqlcontext?

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HP Interview -2016 Unix 1) grep command in unix 2) what is set command

1 Answers   HCL,

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What is pessimistic concurrency control? : Transact sql

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Define implicit and explicit cursors.

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Write a query to display the current date in sql?

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What is sqlca in powerbuilder?

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How many types of primary keys are there?

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What is pl/sql and what is it used for?

4 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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