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| Trouble using TIMESTAMPADD in Where clause of a query to Invoices |
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| Posted : 2008-05-08 08:03:58 |
I am having trouble using the TIMESTAMPADD function in a query against the Invoice table. The following statement doesn't work:
select top 10 TxnDate, SubTotal from Invoice NOSYNC Where TxnDate>={d'2007-07-01'} and TxnDate < { fn TIMESTAMPADD(SQL_TSI_MONTH,-1, {fn CURDATE()} )}
The error I get is: [QODBC] Invalid Operand for operator: <
However, the following similar statements do work:
SELECT top 10 TimeCreated from Customer NOSYNC where TimeCreated < {fn TIMESTAMPADD(SQL_TSI_MONTH,-1, {fn CURDATE()} )}
SELECT top 10 TxnDate, SubTotal from Invoice NOSYNC Where TxnDate >={d'2007-07-01'} and TxnDate < {fn CURDATE()}
So why would the addition of the TIMESTAMPADD function not work in a query to Invoice when the same clause works in a query to Customer? |
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| Tom |
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| Group | : Administrator |
| Posts | : 5510 |
| Joined | : 2006-02-17 |
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| Posted : 2008-05-08 08:30:54 |
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| Posted : 2008-05-09 03:11:07 |
When I use date functions in the WHERE clause my query takes much longer than when I use a constant. I believe that it is doing a full table-scan instead of an indexed search.
The following statement takes 6 minutes to execute:
select TxnDate,SubTotal from Invoice NOSYNC
where TxnDate> {fn CONVERT( {fn TIMESTAMPADD(SQL_TSI_MONTH,-8, {fn CURDATE()} )}, SQL_DATE)}
However, this statement only takes 38 seconds:
select TxnDate,SubTotal from Invoice NOSYNC
where TxnDate> {d'2007-09-08'}
How can I get performance like the first statement using date functions? I am performing this query through an OpenQuery statement in SQL Server. I can't do the string manipulation in SQL Server because "OPENQUERY does not accept variables for its arguments". ( http://msdn.microsoft.com/en-us/library/ms188427.aspx ) |
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| Tom |
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| Group | : Administrator |
| Posts | : 5510 |
| Joined | : 2006-02-17 |
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| Posted : 2008-05-09 07:45:08 |
That's correct, functions need to be evaluated during execution while constants are loaded prior to execution. You can try forcing the evaluation on a subset first like this:-
select {fn Curtime()}, TxnDate,SubTotal from Invoice NOSYNC
where TxnDate> {d'2007-08-01'}
and TxnDate> {fn CONVERT( {fn TIMESTAMPADD(SQL_TSI_MONTH,-8, {fn CURDATE()} )}, SQL_DATE)} |
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