SQL by Mark Chen & TechShelve

Author:Mark Chen & TechShelve
Language: eng
Format: mobi
Publisher: UNKNOWN
Published: 2016-10-04T23:00:00+00:00

UNION

The UNION operator in SQL is pretty much the same as its name implies. In the world of SQL, it behaves following the similar pattern as it did in the algebraic world. In a nutshell, the UNION operator allows you to bring up information from more than one tables which are made up of the same kind of structure and combines them together.

When talking about structure here, please note that we are referring to:

All the tables must have the same number of columns

The values in the corresponding columns should be comprised of identical data type and length

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