Question

I have a question about retrieving data using SQL

i want to get

count(comments_id) where comment_year = 2012 and 
count(comments_id) where comment_year = 2013 

in one query to get the output like this:

year12_comments  |  year13_comments
7                |  8         

I hope its clear.

Answer 1

COUNT(CASE WHEN comment_year = 2012 THEN 1 END) year12_comments,
COUNT(CASE WHEN comment_year = 2013 THEN 1 END) year13_comments,

If you are using MS SQL Server 2005 or above, you can use PIVOT