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tokue
Starting Member
16 Posts |
 Posted - 2011-11-13 : 00:14:21
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| I have two tables (questions, answers), I need my select statement to return all questions from the first table (questions) and return number of answers for each question from the second table... I tried to write it but when a question has no answers at all in the second table it will not returned at all, how can I fix it so I will have questionTitle even if it hasn't any answers in the second table, please:SELECT q.questionID, q.questionTitle,numberOfAnswers=COUNT(a.answerID) FROM questions q LEFT JOIN answers a ON q.questionID=a.questionID GROUP BY q.questionID, q.questionTitle |
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nigelrivett
Master Smack Fu Yak Hacker
3385 Posts |
Posted - 2011-11-13 : 02:59:12
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| Not sure why that doesn't work - it should.Are you sure you don't have a where clause?==========================================Cursors are useful if you don't know sql.SSIS can be used in a similar way.Beer is not cold and it isn't fizzy. |
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tokue
Starting Member
16 Posts |
Posted - 2011-11-13 : 05:01:13
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| I am so sorry, yes I have a where clause but forgot to write it here, here is my code again:SELECT q.questionID, q.questionTitle,numberOfAnswers=COUNT(a.answerID) FROM questions q LEFT JOIN answers a ON q.questionID=a.questionID WHERE (q.dontShow=0 AND a.dontShow=0) GROUP BY q.questionID, q.questionTitle |
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nigelrivett
Master Smack Fu Yak Hacker
3385 Posts |
Posted - 2011-11-13 : 10:11:47
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| SELECT q.questionID, q.questionTitle,numberOfAnswers=COUNT(a.answerID) FROM questions q LEFT JOIN answers a ON q.questionID=a.questionID AND a.dontShow=0WHERE q.dontShow=0GROUP BY q.questionID, q.questionTitle==========================================Cursors are useful if you don't know sql.SSIS can be used in a similar way.Beer is not cold and it isn't fizzy. |
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visakh16
Very Important crosS Applying yaK Herder
52326 Posts |
Posted - 2011-11-13 : 12:07:14
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quote:
Originally posted by tokue
I am so sorry, yes I have a where clause but forgot to write it here, here is my code again:SELECT q.questionID, q.questionTitle,numberOfAnswers=COUNT(a.answerID) FROM questions q LEFT JOIN answers a ON q.questionID=a.questionID WHERE (q.dontShow=0 AND a.dontShow=0) GROUP BY q.questionID, q.questionTitle
see this to understand why it didnt workhttp://weblogs.sqlteam.com/jeffs/archive/2007/05/14/criteria-on-outer-joined-tables.aspx------------------------------------------------------------------------------------------------------SQL Server MVPhttp://visakhm.blogspot.com/ |
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tokue
Starting Member
16 Posts |
Posted - 2011-11-13 : 17:58:03
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Thank you for your replies and help, now I understand why it didn't work. |
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visakh16
Very Important crosS Applying yaK Herder
52326 Posts |
Posted - 2011-11-14 : 00:26:07
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| welcome------------------------------------------------------------------------------------------------------SQL Server MVPhttp://visakhm.blogspot.com/ |
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select with count