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POMYSQL Double Nest SELECT
 

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    <p>I have a 'double' nested SELECT statement. The deeper statement pulls the values I need for the per month total I am trying to insert into an existing row. However each "Segment' has differing percentages so it results in multiple rows. To get around this I have an outer select that then does a SUM the result. </p> <p>More problem is I am unable to match the result to the month as the when I try to link to the columns name 'Enrol_month_short' I get the following message.</p> <p>"Unknown column 'Enrol_month_short' in 'where clause'"</p> <pre><code>SELECT Date_format(tbl_client_details.cd_enrol_date, '%b %y')AS Enrol_month_short, Sum(tbl_revenue.rev_value) AS Enrol_Cum_Rev, (SELECT Sum(tbl_revenue.rev_value) FROM tbl_client_details LEFT OUTER JOIN gridlock.tbl_revenue ON tbl_client_details.cd_zbi_no = tbl_revenue.rev_zbi_no AND tbl_client_details.cd_ucn = tbl_revenue.rev_ucn WHERE ( Date_format(tbl_client_details.cd_enrol_date, '%b %y') = enrol_month_short ) AND ( Date_format(rev_month, '%b %y') = enrol_month_short ) GROUP BY Date_format(tbl_client_details.cd_enrol_date, '%b %y')) AS New_client_rev, (SELECT Count(tbl_client_details.cd_id) FROM tbl_client_details WHERE ( tbl_client_details.cd_enrol_date &gt;= '2012-04-01' AND tbl_client_details.cd_enrol_date &lt;= '2012-07-31' ) AND Date_format(tbl_client_details.cd_enrol_date, '%b %y') = enrol_month_short GROUP BY Date_format(tbl_client_details.cd_enrol_date, '%b %y')) AS Actual_Enrols, (SELECT ( ( Sum(tbl_revenue.rev_value) * ( tbl_segment.seg_growth_2012 / 100 ) ) / 12 ) AS YEAR_NEW_BUS_BUDGET FROM tbl_client_details LEFT OUTER JOIN tbl_revenue ON tbl_client_details.cd_zbi_no = tbl_revenue.rev_zbi_no AND tbl_client_details.cd_ucn = tbl_revenue.rev_ucn LEFT OUTER JOIN tbl_segment ON tbl_client_details.cd_segment = tbl_segment.seg_name WHERE ( rev_month &gt;= '2012-04-01' AND rev_month &lt;= '2012-07-31' ) GROUP BY enrol_month_short) AS YEAR_NEW_BUS_BUDGET FROM tbl_client_details LEFT OUTER JOIN gridlock.tbl_revenue ON tbl_client_details.cd_zbi_no = tbl_revenue.rev_zbi_no AND tbl_client_details.cd_ucn = tbl_revenue.rev_ucn WHERE ( tbl_client_details.cd_enrol_date &gt;= '2012-04-01' AND tbl_client_details.cd_enrol_date &lt;= '2012-07-31' ) AND ( rev_month &gt;= '2012-04-01' AND rev_month &lt;= '2012-07-31' OR rev_month = NULL ) GROUP BY enrol_month_short ORDER BY tbl_client_details.cd_enrol_date; </code></pre>
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    1. USEishman
    1. USEishman
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    1. COhope you don't have the query that way in your code. Please paste the nicely formatted query
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      1. USRene Pot
    2. COWhich table does enrol_month_short come from?
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      1. USBugFinder
    3. CODoing a `DATE_FORMAT` call in your query and using it for comparisons is going to be brutally slow. You really should be storing a version of the date in the format required, then indexing on that for join purposes.
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      1. UStadman
 

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