SQL - SET Operator

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SET Operator

What is a SET operator? What are the types what is the difference between SET operators and JOINS?

Total Answers and Comments: 2

Last Update: May 16, 2008 Asked by: jagadeesh9

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Submitted by: krishnaindia2007

SET operators are used to combine similar type of data from two or more tables. The no of columns and their data type must be same in all the queries. The column names from the first query will appear in the result.

UNION - It returns rows of first query + rows of second query minus duplicate rows
UNION ALL - It returns rows from both the queries including duplicate rows.
MINUS - Rows that are unique for the first query will be retrieved
INTERSECT - common rows from both the queries will be retrieved.

Join is used to select columns from two or more tables.

Above answer was rated as good by the following members:
sourena_1237, akhlaq

April 23, 2008 04:06:45

Archana

Member Since: September 2005 Contribution: 4

RE: SET Operator

In table the data is represented as relation the operators used to operate this type of data is known as set operater.Some set operators are: 1.union() 2.intersection() 3.minus() etc...

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May 16, 2008 04:12:01

krishnaindia2007

Member Since: September 2007 Contribution: 854

RE: SET Operator

SET operators are used to combine similar type of data from two or more tables. The no of columns and their data type must be same in all the queries. The column names from the first query will appear in the result.

UNION - It returns rows of first query + rows of second query minus duplicate rows
UNION ALL - It returns rows from both the queries including duplicate rows.
MINUS - Rows that are unique for the first query will be retrieved
INTERSECT - common rows from both the queries will be retrieved.

Join is used to select columns from two or more tables.

Is this answer useful? Yes | No

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