Difference between revisions of "COUNT()"
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==See Also== | ==See Also== | ||
| − | [[SQL Aggregate Functions|AGGREGATES]], [[AVG()]], [[MAX()]], [[MIN()]], [[SQL SELECT|SELECT]], [[SUM()]] | + | [[SQL Aggregate Functions|AGGREGATES]], [[AVG()]], [[SQL MAX()|SQL MAX()]], [[SQL MIN()|MIN()]], [[SQL SELECT|SELECT]], [[SUM()]] |
Revision as of 14:40, 20 March 2009
Contents
COUNT()
Class
SQL Applications
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 Database Server, Recital Mirage Server, Recital Terminal Developer
