sql - How to count number of occurrences for all different values in database column?

Question

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?

Answer 1

Group by the column you are interested in and then use count to get the number of rows in each group:

SELECT column5, COUNT(*)
FROM table1
GROUP BY column5