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select only the first row in a group

select only the first row in a group

(OP)
If I have data

a  1
a  2
a  3
b  3
b  2
c  1
c  2
d  2

I only want to select a, b, c, and d's first record.like
a  1
b  3
c  1
d  2

how do I do it

RE: select only the first row in a group

Maybe this is convenient:

select <col1>, min(<col2>) from <table> group by <col1>

Results:
a 1
b 2
c 1
d 2

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