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POMySQL Joining to Same Table with Multiple ON Conditions?
 

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    <p>Still a mysql newb and I looked extensively through previous questions trying to find an appropriate solution.</p> <p>I have two tables <code>CaseReportsTempImport2011Q3</code> and <code>FDADrugsDB</code>, I want to do a left join to match <code>CaseReportsTempImport2011Q3.drugname</code> to <code>FDADrugsDB.ReferenceDrugName</code> and <code>FDADrugsDB.DrugName</code> </p> <p>What I envisioned was something like:</p> <pre><code>SELECT DISTINCT(CaseReportsTempImport2011Q3.DRUGNAME) , FDADrugsDB_Product.drugname , FDADrugsDB_Product.ReferenceDrug , FDADrugsDB_Product.activeingred FROM CaseReportsTempImport2011Q3 LEFT JOIN FDADrugsDB_Product ON CaseReportsTempImport2011Q3.DRUGNAME LIKE TRIM(FDADrugsDB_Product.ReferenceDrug) LEFT JOIN FDADrugsDB_Product ON CaseReportsTempImport2011Q3.DRUGNAME LIKE TRIM(FDADrugsDB_Product.DrugName) ORDER BY LENGTH(CaseReportsTempImport2011Q3.DRUGNAME) ASC </code></pre> <p>But that doesn't work I get 'Not unique table/alias: 'FDADrugsDB_Product'' - Any help?</p> <p>Thanks</p> <p><strong>EDIT FOR BETTER SOLUTION REQUEST/REPHRASE</strong> Per borealids "However, I'm not sure this is what you want to do - joining the table twice will produce a multiplicative number of results. I think you might have wanted one join with an ON ... OR ..., making the join condition an "or" of the two reasons for linkage."</p> <p>I would like to know how to do that.</p> <p><strong>SOLUTION</strong> ON CaseReportsTempImport2011Q3.DRUGNAME LIKE TRIM(FDADrugsDB_Product.ReferenceDrug) OR CaseReportsTempImport2011Q3.DRUGNAME LIKE TRIM(FDADrugsDB_Product.DrugName</p> <p>Thanks tom and borealid.</p>
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    1. COJust use `AND` / `OR` as you would with `WHERE` like `JOIN foo ON foo.fk = bar.id AND foo.name = bar.name` and remove the second `JOIN` or alias your tables though that seems pointless
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