T-SQL Query | [ The Company Code Puzzle ]  – In this puzzle we have to change values of A, B and CompanyCode to NULL if repeating values are there. Please check out the sample input and expected output for details.

Sample Input

 A B C CompanyCode GL 1 1 1 AA 1 1 1 2 AA 2 1 1 3 AA 3 1 1 4 AA 4 2 2 1 BB 1 2 2 2 BB 2

Expected Output

 A B C CompanyCode GL 1 1 1 AA 1 NULL NULL 2 NULL 2 NULL NULL 3 NULL 3 NULL NULL 4 NULL 4 2 2 1 BB 1 NULL NULL 2 NULL 2

Rules/Restrictions

• The solution should be should use “SELECT” statement or “CTE”.

Script

Use the below script to generate the source table and fill them up with the sample data.

 ``` --Create table CREATE TABLE [dbo].[TheCompanyCode] ( [A] [int] NULL, [B] [int] NULL, [C] [int] NULL, [CompanyCode] [varchar](100) NULL, [GL] [varchar](100) NULL ) GO --Insert Data INSERT INTO TheCompanyCode(A,B,C,CompanyCode,GL) VALUES (1,    1,     1,     'AA',  001), (1,    1,     2,     'AA',  002), (1,    1,     3,     'AA',  003), (1,    1,     4,     'AA',  004), (2,    2,     1,     'BB',  001), (2,    2,     2,     'BB',  002) --Verify Data SELECT * FROM TheCompanyCode ```

Update May 14 | Solution

 ``` -- /************ SOLUTION 1 ****************/ ;WITH CTE AS ( SELECT A,B,C,CompanyCode,GL, ROW_NUMBER() OVER (PARTITION BY A,B,CompanyCode ORDER BY %%Physloc%%) rrnk FROM TheCompanyCode ) SELECT CASE WHEN rrnk = 1 THEN A ELSE NULL END A ,CASE WHEN rrnk = 1 THEN B ELSE NULL END B ,C ,CASE WHEN rrnk = 1 THEN CompanyCode ELSE NULL END CompanyCode ,GL FROM CTE -- ```

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