c# - IN Operator in OLEDB

Question

I am using OLEDB connection to read data from excel files. I am facing issues while using IN operator in the Select query. Below is my query,

string EmployeeIds = "'1231','1232','1233'";
SELECT [Employee Number],[Employee Name],[First In Time],[Last Out Time],[Total Work Hours] 
FROM [Sheet0$A2:J] 
WHERE  [Employee Number] IN (?);

 comm.Parameters.AddWithValue("?",EmployeeIds);

I am getting empty results but if I give only single value then I am getting result. Please help.

Answer 1

where someval in ('123,456,789')

is very different to:

where someval in (123,456,789)

The second line tests someval against 3 numeric values; the first line tests somevalagainst a single string value that happens to contain numbers and commas (but those numbers and commas are irrelevant).

You cannot do what you want without (one of):

• writing the SQL dynamically to have one parameter per value, i.e. in (?,?,?,?)
• making use of some feature of the backend to do the split - for example STRING_SPLIT in recent versions of SQL Server (this will be very backend specific); I do not know enough about Excel to advise on whether such a feature exists