wbooster
Computer
- Feb 4, 2007
- 2
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 1
c 3
d 2
how do I do it
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 1
c 3
d 2
how do I do it