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Child and Parent Query


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  #1  
Old November 6th, 2012, 10:50 AM
jai3738 jai3738 is offline
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Child and Parent Query
I have a query : How can i select catid,catname,parentname from given below table.

Table name is : categories
catid catname parent_id
1 abc 0
2 xyz 1
3 pqr 1

Kindly help me out . Thanks and Regards .
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Old November 6th, 2012, 11:11 AM
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Is this homework?
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Old November 6th, 2012, 03:21 PM
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Quote:
Originally Posted by cafelatte
Is this homework?
yes

this same problem shows up every year, and i've seen it four times this week
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  #4  
Old November 7th, 2012, 08:03 AM
jai3738 jai3738 is offline
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No
Quote:
Originally Posted by cafelatte
Is this homework?

No It is mysql table . And i want to make a query as i mentioned .
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Old November 7th, 2012, 08:36 AM
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Then perhaps you should show us what you have tried rather than posting a question that smells like homework... but isn't homework.
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Old November 7th, 2012, 08:58 AM
jai3738 jai3738 is offline
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Actually i am also confused what will be the answer of this question As i need to pull catid,catname,parentname from given table . I am using left outer join for this. But i dont know it is right or not to use left outer join .
I made a query like this : select (A.catname) as parentname,B.catid,B.catname from cat as A left outer join cat as B on A.catid=B.parent_id
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Old November 7th, 2012, 09:13 AM
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That's very good. Now, if only you had used NULL instead of 0 for orphaned elements...
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