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Display average of database entries?

Thread began 12/16/2009 12:22 am by ijk76319396 | Last modified 12/16/2009 3:54 pm by Jason Byrnes | 823 views | 5 replies |

ijk76319396

Display average of database entries?

I have users rate each page on a scale of 1 to 5. I would like for the average rating to be displayed on the page. I have already created a recordset which has the table filtered by the user's ID. How can I display the average rating?

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Jason ByrnesWebAssist

The SQL AVG() function to can used to get the average from a column:

SELECT AVG(rating) AS averageRating FROM table
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ijk76319396

Can you check that this query is correct, when I go to open it in the bindings panel I get the message MySQL Error#: 1064

You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'table
WHERE 0 = 1' at line 1


$query_rsAVGRATING = sprintf("SELECT AVG(rating) AS averageRating FROM table WHERE ID = %s", GetSQLValueString($colname_rsAVGRATING, "int"));
$rsAVGRATING = mysql_query($query_rsAVGRATING, $con2com) or die(mysql_error());
$row_rsAVGRATING = mysql_fetch_assoc($rsAVGRATING);
$totalRows_rsAVGRATING = mysql_num_rows($rsAVGRATING);
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ijk76319396

Fixed it, I left the value as 'table' instead of inserting the name of my table.

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ijk76319396

Another issue

Another issue came up with some of the averages being way to long in size, how can I limit the average to be displayed to only two decimals, for example instead of showing 2.24333333, have it cut off at 2.24?

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Jason ByrnesWebAssist

use the MySQL FORMAT function:
FORMAT(number to format, number of decimal places)

for 2 decimal places:

SELECT FORMAT(AVG(rating), 2) AS averageRating FROM table
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