I want to use IFNULL()
in such a way that I can select the record containing NULL or, if a value is present, then select the record matchinga particular value.
My query is:
SELECT (@v:=2) AS Row, CL.LeaveTypeId, CL.NumberOfLeave
FROM `CompanyLeave` CL
WHERE(IFNULL(CL.EmploymentType,0)=3);
column EmploymentType
can contain either an Integer
or NULL
.
I want to select the record matching the specified value, or, if none matches, then the record containing NULL
.
I am interpreting the question as a prioritization. If a record with 3
exists, choose that. Otherwise, choose the one that is NULL
, if it exists.
If so, this might do what you want:
SELECT (@v:=2) AS Row, CL.LeaveTypeId, CL.NumberOfLeave
FROM `CompanyLeave` CL
WHERE CL.EmployementType = 3 or CL.EmployementType IS NULL
ORDER BY (CL.EmployementType = 3) DESC
LIMIT 1;
This will return the row with 3
, if present. Otherwise, it will return a row with NULL
, if one exists.