Personally I would always recommend using a date (calendar) table in your database ratherthan a date calculation as you allow not oly for leap years but also all other special dates, company financial year etc. I think we should avoid re-inventing the wheel and check a date against what Microsoft has done for us (even in 2008 the functionality exists as it knows if there are 29 days if you ask it that question directly) hence I think it works to take one off 1st march and test if its 29 in SQL Server 2008 and use the function Pinal spoke of for 2012
I have found no combination where you can get the result sets that were produced after an error.ADO also takes the freedom to make its own considerations about what is an error. And if SQL Server emits a message with a severity level of 10 or lower, SQL Server does not set @@error, and thus you cannot tell from T-SQL that the message was produced
sql server - How to efficiently check EXISTS on multiple columns? - Database Administrators Stack Exchange
Single Aggregate Query SELECT MAX(CASE WHEN B IS NULL THEN 1 ELSE 0 END) AS B, MAX(CASE WHEN C IS NULL THEN 1 ELSE 0 END) AS C FROM T This could process both columns at the same time so have a worst case of one full scan. SELECT TOP 2 * FROM (SELECT DISTINCT CASE WHEN b IS NULL THEN NULL ELSE 'foo' END AS b , CASE WHEN c IS NULL THEN NULL ELSE 'bar' END AS c FROM test T WHERE LEFT(b,1) + LEFT(c,1) IS NULL ) AS DT Edit 2 One last tweak that occurred to me is that the query above could still end up processing more rows than necessary in the event that the first row it encounters with a NULL has NULLs in both column B and C
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Microsoft OLAP by Mosha Pasumansky : How to check if cell is empty in MDX
However the consultant who developed these calculated members wanted to avoid division by zero so he wrapped the expression inside IIF MDX function (on the side note, this is wide spread practice, but I really wonder whether it is worth it. Note, that if the cell value is empty, it is treated as number zero in arithmetic operations, however, it is possible, that b had value zero, which is not empty ! Therefore check for IsEmpty is appropriate when the user wants to differentiate empty or missing values from the existing values (for example in NON EMPTY like analysis), but is not appropriate for checks in division by zero
*l.value3 and r.value2 are not comparable (although there might exist a correlation) *l.value3 is nullable (which I think is not a big deal because the condition is out of the NOT IN clause). So with the join you would want when r.value is not null For Each r.value ALL r.value2 1 (this part is hard to explain: just remember that r.value can have multiple r.value2 associated to it and we want all of them to be different from 1) So now I am stuck searching for a way to express existential and universal conditions
Mimicking null-safe equal to operator in SQL Server - CodeProject
If you have a bit field that sometimes gets set to NULL by shoddy programming standards on the part of your web programmers, and you want to assume that NULL means false on that basis, then fix the problem at source. For example if user sometimes defines a search criteria for column1 and sometimes for both column1 and column2 and the criteria can hold a value or be null
SQL Server Reporting Services - Check For Null Column Value in an expression. - mredkj.com
After fiddling around with IsDbnull which will not raise an error but which will also not work I found that IsNothing will correctly check for a null value
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