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mysql count and group by

Posted on 2014-12-08
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Last Modified: 2014-12-12
I have a table as follows:

id       name
1        Complete
2        Incomplete
2        Incomplete
1        packaged
3        complete
4        packaged
4        packaged

How can I do a count statement to get the following output:
complete  2
incomplete 1
packaged 2

The reason that "incomplete" is 1 is because it is grouped by id, the same is with "packaged".  Can someone let me know how I can get a count of "name"  by grouping by 'id" ?

Thank you,
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Question by:aej1973
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4 Comments
 
LVL 143

Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 40488263
you have to "distinct" first:
select name , count(*)
  from ( select id, name from yourtable group by id, name )
group by name

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0
 

Author Comment

by:aej1973
ID: 40490115
I am getting this error "Every derived table must have its own alias". What does this mean?
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LVL 143

Accepted Solution

by:
Guy Hengel [angelIII / a3] earned 2000 total points
ID: 40490612
it means the subquery needs an alias:
select name , count(*)
  from ( select id, name from yourtable group by id, name ) SQ
group by name 

Open in new window

SQ is the alias name given to the subquery.
side note about "aliases" for columns and tables in general:
http://www.experts-exchange.com/Database/Miscellaneous/A_11135-Why-should-I-use-aliases-in-my-queries.html
0
 

Author Comment

by:aej1973
ID: 40496670
Thank you.
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