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select 1st column element based on criteria in 2nd column in mathematica

• To: mathgroup at smc.vnet.net
• Subject: [mg124139] select 1st column element based on criteria in 2nd column in mathematica
• From: Hani <hanisantosa at gmail.com>
• Date: Wed, 11 Jan 2012 04:18:03 -0500 (EST)
• Delivered-to: l-mathgroup@mail-archive0.wolfram.com

hello, I have a question.

Suppose I have a table with two columns like this:

1  3
2  4
3  6
4  1
5  3
6  2
7  5
8  2

I want to select elements of the 1st column which its corresponding 2nd
column elements are bigger than 3. so, the result should be {2,3,7}.  How to
implement that in mathematica? Thanx a lot