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26 paź 2018 · The Jet/ACE SQL dialect does support IS NULL. However, as your current results suggest, empty strings ('') are not the same as the NULL entity. This is especially true in Excel (a non-database application where empty cells may not default to NULL).
26 lip 2013 · You need to select one type or the other for the field, the field type can't vary by row. The simplest is to remove the ELSE '-' and let it implicitly get the value NULL instead for the second case.
9 kwi 2022 · Solved: Hello, I need to combine 2 columns based on if one of them is NULL. I will say it in English: if [Name_FBL1N_Stampli] is Null then use.
11 lip 2012 · Is there any better way to write the lines below in SQL Server 2005? CASE WHEN (ID IS NULL) THEN 'YES' WHEN (ID IS NOT NULL) THEN 'NO' END 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:
9 lut 2009 · Handling the Issue of NULL and Empty Values. Then let’s try to handle the record having the NULL value and set as a new value the string “NewValue” for the result set of our select statement. SQL Server provides 2 functions for doing this; (i) the ISNULL; and (ii) the COALESCE.
Use SQL CASE expressions: SELECT ColumnA, CASE WHEN ColumnA IS NULL THEN Column1 ELSE Column3 END AS ColumnB, CASE WHEN ColumnA IS NULL THEN Column2 ELSE Column4 END AS ColumnC FROM TestTable
