Question

I’m trying to come up with a table that displays the total number of common elements in a table.

For example. I have a table A with values:

colName
=============
a
b
b
c
c
c
d

Is there any way that I can come up with a result that displays:

colName totalCount
==================
a        1
b        2
c        3
d        1

Answer 1

This is a simple query using an aggregate function COUNT and GROUP BY clause.

SELECT   colName, COUNT(colName) totalCount
FROM     tableName
GROUP BY colName

totalCount is called the ALIAS of COUNT(colName)