SQL subquery with COUNT help

Question

I have an SQL statement that works

SELECT * FROM eventsTable WHERE columnName=\'Business\'

I want to add this as a subquery...

Answer 1

SELECT e.*,
       cnt.colCount 
FROM eventsTable e
INNER JOIN (
           select columnName,count(columnName) as colCount
           from eventsTable e2 
          group by columnName
           ) as cnt on cnt.columnName = e.columnName
WHERE e.columnName='Business'

-- Added space