A Guide to SQL
A Guide to SQL
9th Edition
ISBN: 9781111527273
Author: Philip J. Pratt
Publisher: Course Technology Ptr
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Chapter 5, Problem 3RQ
Program Plan Intro

Subquery:

Any SQL query can be written in the sub query approach.

  • The SQL subquery returns one or more column as the result.
    • Most SQL systems return a pair wise joining of one and only one column in an inner query with one column of an outer query.
    • The data displayed form the table referenced in outer query only.

Join: Join is a relational operation, which combines the data from two or more tables into single table or view.

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