Difference between revisions of "COUNT()"

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Line 18: Line 18:
 
<code lang="recital">
 
<code lang="recital">
 
// Get a count of all rows in the accounts table.
 
// Get a count of all rows in the accounts table.
SELECT COUNT(*) Total FROM accounts;
+
SELECT COUNT(*) Total FROM accounts
  
 
// Get a count of jobs
 
// Get a count of jobs
SELECT COUNT(jobs) Jobs FROM employee;
+
SELECT COUNT(jobs) Jobs FROM employee
  
 
// Get a count of distinct rows for jobs
 
// Get a count of distinct rows for jobs
SELECT COUNT(DISTINCT jobs) Jobs FROM employee;
+
SELECT COUNT(DISTINCT jobs) Jobs FROM employee
 
</code>
 
</code>
  

Revision as of 17:15, 22 December 2009

Purpose

Returns the number of rows in a SELECT statement query


Syntax

COUNT(* | [DISTINCT] <expr>)


See Also

AGGREGATES, AVG(), SQL MAX(), MIN(), SELECT, SUM()


Description

Returns the number of rows in the query. If you specify DISTINCT, then only the rows which are unique in <expr> are counted. Specifying <expr> on its own returns the number of rows from the query for which <expr> is not NULL. If you specify the asterisk (*), then all rows are counted.


Example

// Get a count of all rows in the accounts table.
SELECT COUNT(*) Total FROM accounts
 
// Get a count of jobs
SELECT COUNT(jobs) Jobs FROM employee
 
// Get a count of distinct rows for jobs
SELECT COUNT(DISTINCT jobs) Jobs FROM employee


Products

Recital Server, Recital