A Guide to SQL
A Guide to SQL
9th Edition
ISBN: 9781111527273
Author: Philip J. Pratt
Publisher: Course Technology Ptr
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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.
    • It is a “SELECT” statement that is nested within another “SELECT” statement.

Characteristics of subquery:

Some of the characteristics of subquery are as follows:

  • It is a query written inside another query.
  • In the query statement, the first query is called as outer query and the query inside the statement is called as inner query.
  • A subquery is usually written inside parentheses.
  • In a query, a subquery is always gets executed first.
  • The output generated from the subquery is used as an input for the outer query.
  • Query inside a query is called as nested query.

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.
    • It is a “SELECT” statement that is nested within another “SELECT” statement.

Characteristics of subquery:

Some of the characteristics of subquery are as follows:

  • It is a query written inside another query.
  • In the query statement, the first query is called as outer query and the query inside the statement is called as inner query.
  • A subquery is usually written inside parentheses.
  • In a query, a subquery is always gets executed first.
  • The output generated from the subquery is used as an input for the outer query.
  • Query inside a query is called as nested query.

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