Difference between revisions of "MAX"

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(Created page with "<h3>MAX</h3> <table align='right' border='1'> <caption>Compatibility</caption> <caption>ABS(f)</caption> <tr><th>Engine</th><th>OK</th><th>Alternative</th></tr> <tr><td align=...")
 
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<table align='right' border='1'>
 
<table align='right' border='1'>
 
<caption>Compatibility</caption>
 
<caption>Compatibility</caption>
<caption>ABS(f)</caption>
+
<tr><th colspan='3'>MAX(f)</th></tr>
<tr><th>Engine</th><th>OK</th><th>Alternative</th></tr>
+
<tr><td align='center'>'''Engine'''</td><td align='center'>'''OK'''</td><td align='center'>'''Alternative'''</td></tr>
<tr><td align='left'>mysql</td><td>Yes</td><td>[[d+ i]]</td></tr>
+
<tr><td align='left'>ingres</td><td>Yes</td><td></td></tr>
<tr><td align='left'>oracle</td><td>No</td><td>[[d+ i]]</td></tr>
+
<tr><td align='left'>mysql</td><td>Yes</td><td></td></tr>
<tr><td align='left'>postgres</td><td>No</td><td>[[d+ i]]</td></tr>
+
<tr><td align='left'>oracle</td><td>Yes</td><td></td></tr>
<tr><td align='left'>sqlserver</td><td>No</td><td>[[d+ i]]</td></tr>
+
<tr><td align='left'>postgres</td><td>Yes</td><td></td></tr>
 +
<tr><td align='left'>sqlserver</td><td>Yes</td><td></td></tr>
 
</table>
 
</table>
 
<p>MAX finds the highest values in a column or part of a column</p>
 
<p>MAX finds the highest values in a column or part of a column</p>

Revision as of 08:41, 13 July 2012

MAX

Compatibility
MAX(f)
EngineOKAlternative
ingresYes
mysqlYes
oracleYes
postgresYes
sqlserverYes

MAX finds the highest values in a column or part of a column

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

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

With a GROUP BY region statement each region shows up just once. The MAX column gives the "largest" name in the region in the context of strings this is the last name alphabetically.

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

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