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15 mar 2013 · 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 · In this situation you can use ISNULL() function instead of CASE expression . ISNULL(B.[STAT], C.[EVENT DATE]+10) AS [DATE]
17 lis 2009 · You can use a CASE statement for this. select Case WHEN Column1 = '' OR Column1 IS NULL OR LEN (TRIM (Column1)) = 0 THEN Column2 ELSE Column1 END as ColumnName from TableName.
1 sie 2017 · You can check if a field or variable is equal to NULL because all comparisons to NULL return NULL (which in a CASE or IF predicate is taken as meaning false), so WHEN <FieldOrVariable> = NULL THEN <output> and WHEN <FieldOrVariable> <> NULL THEN <output> will never match.
11 lip 2012 · I'm not familiar with MSSQL but if it has something like IF-function in MySQL, you can write such code: IF(ID IS NULL, 'YES', 'NO') AS ID_Value –
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:
6 cze 2024 · We can use the function NULLIF to compare and check if the column contains null or empty values: SELECT id, name FROM Department WHERE NULLIF(TRIM(code), '') IS NULL; The NULLIF function evaluates its two arguments, returning NULL if they are equal.
