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    <p>when you use a function on the column:</p> <pre><code>date(datepif) &gt; '01/06/2009' AND date(datepif) &lt;= '01/06/2010' </code></pre> <p>an index will NOT be used. Try something like this</p> <pre><code>datepif &gt; someconversionhere('01/06/2009') AND datepif &lt;= someconversionhere('01/06/2010') </code></pre> <p>Use inner joins too. There isn't any info in the question to indicate table size or if there is an index or not, so this is a guess and should work best if there are many more rows in billspaid for the date range vs rows that match the joining tables for r.controlno = 1234567, which I suspect is the case:</p> <pre><code>SELECT COALESCE(b1.billyr,b2.billyr) AS billyr ,COALESCE(b1.billno,b2.billno) AS billno ,COALESCE(b1.propacct,b2.propacct) AS propacct ,COALESCE(b1.vinid,b2.vinid) AS vinid ,COALESCE(b1.taxpaid,b2.taxpaid) AS taxpaid ,COALESCE(b1.duedate,b2.duedate) AS duedate ,COALESCE(b1.datepif,b2.datepif) AS datepif ,COALESCE(b1.propdesc,b2.propdesc) AS propdesc FROM rtadba.reasacct r INNER JOIN cwdba.txpyaccts a ON r.accountno=t.accountno INNER JOIN cwdba.txpytaxid t ON a.taxpayerno=t.taxpayerno LEFT OUTER JOIN trcdba.billspaid b1 ON t.custno=b1.custno AND b1.datepif &gt; someconversionhere('01/06/2009') AND b1.datepif &lt;= someconversionhere('01/06/2010') LEFT OUTER JOIN trcdba.billspaid b2 ON t.custno2=b2.custno AND b2.datepif &gt; someconversionhere('01/06/2009') AND b2.datepif &lt;= someconversionhere('01/06/2010') WHERE r.controlno = 1234567 AND COALESCE(b1.custno,b2.custno) IS NOT NULL </code></pre> <p>create an index for each of these:</p> <pre><code>rtadba.reasacct.controlno and cover on accountno cwdba.txpyaccts.accountno and cover on taxpayerno cwdba.txpytaxid.taxpayerno and cover on custno trcdba.billspaid.custno +datepif trcdba.billspaid.custno2 +datepif </code></pre>
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    1. PONeed to speed up the results of this SQL statement. Any advice?
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    1. COGood point about the function on the column.
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      1. USMarcus Adams
    2. COAnd if you are having to use a function on date information to convert it to a date, then you need to store the information in a field with the correct datetime datatype. Any time you are having to convert data in order to use it, that is an indicator that your table design is bad.
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    3. COVery nice answer, +1. Couldn't you move the condition `r.controlno = 1234567` onto the first inner join for just a hair more performance?
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      1. USNick Larsen
 

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