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15 mar 2013 · Try this one instead: CASE LEN (ISNULL (last_Name,'')) WHEN 0 THEN '' ELSE ' ' + last_name END AS newlastName. LEN (ISNULL (last_Name,'')) measures the number of characters in that column, which will be zero whether it's empty, or NULL, therefore WHEN 0 THEN will evaluate to true and return the '' as expected.
26 lip 2013 · I changed it to ISNULL and the error is now: Msg 4145, Level 15, State 1, Line 10 An expression of non-boolean type specified in a context where a condition is expected, near 'ISNULL'. –
The SQL Server ISNULL() function lets you return an alternative value when an expression is NULL: SELECT ProductName, UnitPrice * (UnitsInStock + ISNULL(UnitsOnOrder, 0)) FROM Products;
There are 3 possible ways to deal with nulls in expressions: using IsNull, Coalesce or CASE. I've explained these under separate headings below! The ISNULL Function. This function substitutes a given value when a column is null. The syntax is:
30 kwi 2012 · Nullability with ISNULL is determined by the nullability of the second function parameter unless the first parameter is non-nullable (which of course eliminates the need for ISNULL). SELECT ISNULL(NULL, NULL) AS Col1 --int NULL ,ISNULL(NULL, 1) AS Col2 --int NOT NULL ,ISNULL(NULL, CAST(NULL AS int)) AS Col3 --int NULL ,ISNULL(1, CAST(NULL AS ...
11 lip 2012 · Yes - I did try CASE WHEN (ID IS NULL) THEN 'YES' ELSE 'NO' END AS ID_Value But I am looking for some other better approach something like IF(ID IS NULL, 'YES', 'NO') AS ID_Value in the Ms Sql, so that everything can be in a single line. Any suggestions please –
17 cze 2019 · The SQL Prompt Best Practice rule checks whether a comparison or expression includes a NULL literal ('NULL'), which in SQL Server, rather than result in an error, will simply always produce a NULL result. Phil Factor explains how to avoid this, and other SQL NULL-related calamities.
