COUNT

Compatibility

COUNT(f)
Engine	OK	Alternative
ingres	Yes
mysql	Yes
oracle	Yes
postgres	Yes
sqlserver	Yes

COUNT

COUNT(column_name) finds the number of non-null values in a column. COUNT(*) also counts the null values.

COUNT is an aggregate function it is normally used with GROUP BY.

  SELECT region, COUNT(name)
    FROM bbc
   GROUP BY region 

With a GROUP BY region statement each region shows up just once. The COUNT column gives the number of countries for each region.

SELECT region, COUNT(name)
  FROM bbc
 GROUP BY region

See also

• AVG function
• SUM function
• MIN function

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