How to count number of occurences for all different values in database column?

Posted by drasto on Stack Overflow See other posts from Stack Overflow or by drasto
Published on 2010-05-19T15:08:46Z Indexed on 2010/05/19 15:10 UTC
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postgresql

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sql

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database

I have a Postgre database that has say 10 columns. The fifth column is called column5. There are 100 rows in the database and possible values of column5 are c5value1, c5value2, c5value3...c5value29, c5value30. I would like to print out a table that shows how many times each value occurs.

So the table would look like this:

Value(of column5)          number of occurrences of the value
     c5value1                              1
     c5value2                              5
     c5value3                              3
     c5value4                              9
     c5value5                              1
     c5value6                              1
        .                                  .
        .                                  .
        .                                  .

What is the command that does that? Thanks for help

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