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Use : "Select * from testtable where (a = ? or a is null) and (b=? or b is null) " This will select cases where a exactly matches the supplied value and will include the null values in the column - if that is what you want.
3 mar 2020 · 1 Answer. Sorted by: 2. This is because you are testing if the data variable is am instance of the None object which, from your output, it's not it's a list. So all you need to do is to change your if statement to if not data: which will fix the problem.
30 paź 2023 · SQL CASE statements coupled with IS NULL/IS NOT NULL checks provide a robust mechanism for handling NULL values in conditional business logic. To recap the key guidelines: Thoroughly check for possible NULLs in every branch of CASE statements.
select sum(case when column2 not in (null, '') then 1 else 0 end) from table1 --query fails! Here the query fails because you are trying to compare a numeric value to an empty string. The data types is not the same.
The SQL CASE Expression. The CASEexpression goes through conditions and returns a value when the first condition is met (like an if-then-else statement). So, once a condition is true, it will stop reading and return the result. If no conditions are true, it returns the value in the ELSEclause.
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:
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
