Question

Assuming this is my table:

email |  col1 |  col2
------+-------+------
a@a   |   1   |   0
a@a   |   0   |   1
b@b   |   0   |   1
c@c   |   1   |   0

I’m trying to update each row where email has more than one of the same entry. In the table above a@a is listed twice with a 1 in col1 and in the next record a 1 in col2. I’d like a single record for a@a with a 1 in both col1 and col2. and then I can remove duplications afterwards.

I should then be left with a table where only in record exists for each email and I can then filter on having 1 in col1, col2 or both.

I’ve tried sorting this data using group by email having col1 = 1 and col2 = 1, but that won’t work (presumably it only filters on the first record found, not a combined subset of the data – makes sense).

I’m sure this is an easy one and I’m just having another one of those days, any help appreciated.

Answer 1

would this help:

select email, max(col1) as col1, max(col2) as col2 from table group by email