PostgreSQL search column for like strings

Question

I'm pretty new to PostgreSQL right now and am trying to search through a column and find where in that column duplicate strings exist.

For example, if I have the following table:

Col_1  Col_2  Col_3
1      cat    45
2      dog    67
3      bird   77
4      cat    90

So essentially, without knowing which specific strings to look for, I want to write a query that would pull both instances of 'cat' from col_2 because they are the same.

Can anyone help out with some suggestions of where to begin/how to do this?

Neil McGuigan · Accepted Answer · 2015-11-05 19:29:24Z

1

select
  Col_2,
  count(*)
from 
  your_table
group by
  Col_2
having
  count(*) > 1

Should do the trick. Well, it will show you which values of Col_2 contain duplicates anyways.

http://sqlfiddle.com/#!15/1d685/1

Please use snake_case in PostgreSQL (all lower chars).

answered Nov 5, 2015 at 19:29

Neil McGuigan

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