Differences between union, unionall, minus, and intersect in Oracle

Source: Internet
Author: User
Union: returns the union of two result sets. Only one repeated part of the two result sets is retained. Unionall: Union of two result sets to retain the duplicate parts of the two result sets. Minus: The result set that appears in the first result set but does not appear in the second result set. Intersect: intersection, the duplicate part of the two result sets. Example

Union: returns the union of two result sets. Only one repeated part of the two result sets is retained. Union all: union of two result sets to retain the duplicate parts of the two result sets. Minus: The result set that appears in the first result set but does not appear in the second result set. Intersect: intersection, the duplicate part of the two result sets. Example

Union: returns the union of two result sets. Only one repeated part of the two result sets is retained.


Union all: union of two result sets to retain the duplicate parts of the two result sets.


Minus: The result set that appears in the first result set but does not appear in the second result set.


Intersect: intersection, the duplicate part of the two result sets.


Example:

A (1, 2, 3, 4, 5, 6)

B (1, 2, 5, 6, 7)

A union B (1, 2, 3, 4, 5, 6, 7)


A union all B (, 7)


A minus B (3, 4)


A intersect B (1, 2, 5, 6)


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