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    <p><strong>Method 1:</strong> </p> <pre><code>SELECT (select SUM(quantity) from Sales join Document on Sales.IdDocument = Document.IdDocument where (IdTipoDocumento = 'vco' or IdTipoDocumento = 'vcr') and IdArticulo = '01-00321' and IdListaEmpresa = 1000129) - (select SUM(quantity) from Sales join Document on Sales.IdDocument = Document.IdDocument where IdTipoDocumento = 'dco' and IdArticulo = '01-00321' and IdListaEmpresa = 1000129) </code></pre> <p><strong>Method 2:</strong></p> <pre><code>SELECT SUM(SQ) FROM ( SELECT CASE WHEN (IdTipoDocumento = 'vco' or IdTipoDocumento = 'vcr') THEN SUM(Quantity) WHEN IdTipoDocumento = 'dco' THEN -1*SUM(Quantity) END AS SQ FROM Sales join Document on Sales.IdDocument = Document.IdDocument where (IdTipoDocumento IN ('vco', 'vcr','dco')) and IdArticulo = '01-00321' and IdListaEmpresa = '1000129' GROUP BY IdTipoDocumento) AS T1 </code></pre> <p><strong>Method 3:</strong></p> <pre><code>SELECT SUM(CASE WHEN IdTipoDocumento IN ('vco', 'vcr') THEN Quantity ELSE -1*Quantity END) AS SQ FROM Sales join Document on Sales.IdDocument = Document.IdDocument where (IdTipoDocumento IN ('vco', 'vcr','dco')) and IdArticulo = '01-00321' and IdListaEmpresa = 1000129 </code></pre> <p><strong>Method 3a:</strong></p> <pre><code> SELECT IdListaEmpresa, SUM(CASE WHEN IdTipoDocumento IN ('vco', 'vcr') THEN Quantity ELSE -1*Quantity END) AS SQ FROM Sales join Document on Sales.IdDocument = Document.IdDocument WHERE (IdTipoDocumento IN ('vco', 'vcr','dco')) AND IdArticulo = '01-00321' AND IdListaEmpresa IN (1000129, 1000130, 1,2,3,4,5) GROUP BY IdListaEmpresa </code></pre>
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    1. POError converting varchar to numeric in SQL subtract query
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    1. COSame error. I think it might be saving the results of each sum(quantity) as varchars instead of numbers?
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    2. COCan you update your sql statements to add single quotes to IdListaEmpresa like `IdListaEmpresa = '1000129'`
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    3. COI tried it. Made no difference, the error remains, IdListaEmpresa is numeric anyways...
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