Question

imagine a table that looks like this

CUST    FLAG1   FLAG2
---------------------
1234    1       0
1234    1       1
1234    1       0
1234    0       1
5678    1       0
5678    1       0
9012    0       1

What I want to do is group by the cust field and combine the flags (which are boolean in nature) so I would get the following result

CUST    FLAG1   FLAG2
---------------------
1234    1       1
5678    1       0
9012    0       1

Can anyone help me with this?

Answer 1

Assuming that “combine the flags” means “OR the flags together” so that if any row has a 1 the end result has a 1, just do a GROUP BY with a MAX

SELECT cust,
       MAX(flag1) flag1, 
       MAX(flag2) flag2
  FROM table_name
 GROUP BY cust