SQL Query to retrieve distinct test id from the test plan

Hi,

I need your help urgently.

I need to retrieve the unique test id from the test plan of HP QC.Few test cases are cut and pasted in the same folder which may have different test id.But I need to know how many unique test cases are present in the folder irrespective of whether the same test cases are moved or copied to the sub folder.

Folder 1 

Sub folder 1-It has 2 test cases

Sub folder 2- It has 4 test cases.2 test cases are copied from sub folder 1 and pasted it in the sub folder 2

Expectation:

My query should pull only distinct test id it means a total of 4 test cases (2 from sub folder 1 and 2 from sub folder 2).

Please help me out.

Regards,

vem