How to Use ALL Keyword in SQL

In this article I am going to explain how to use ALL Keyword in SQL.
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Introduction

In this article I am going to explain how to use ALL Keyword in SQL. A select statement known as subquery if it is codded within another SQL statement. Subquery can return a single value or a result set. This result set may contain a single column or more than one column.

There are four way to create subquery  in a SELECT statement.

  • In WHERE Clause
  • In HAVING Clause
  • In FROM Clause
  • In SELECT Clause

ALL Keyword in SQL is used to test that a comparison condition is true for all of the value return by subquery. We use ALL keyword with comparison operators like >,<,>= and <= .

Example

SELECT * FROM dbo.mcninvoices

WHERE invoicetotal > ALL

( SELECT invoicetotal

FROM dbo.mcninvoices WHERE invoiceid = 8)

Output 

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