mySQL INSERT INTO SELECT not working

Posted by Industrial on Stack Overflow See other posts from Stack Overflow or by Industrial
Published on 2010-05-08T13:46:29Z Indexed on 2010/05/08 13:58 UTC
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Hi everyone,

I am trying to implement the "Closure Table" structure in a php/mySQL webapp from Bill Karwins "SQL Antipatterns" slideshare presentation: http://www.slideshare.net/billkarwin/sql-antipatterns-strike-back

The first step is to insert some stuff into my tree (page 73 in slide):

Easy to insert a new child of comment #5:

INSERT INTO Comments ... (Generates comment #8)

INSERT INTO TreePaths (ancestor, descendant)
VALUES (8, 8);

INSERT INTO TreePaths (ancestor, descendant)
SELECT ancestor, 8 FROM TreePaths
WHERE descendant = 5;

I try to translate all this into Codeigniters active record db-style language, and that's about where I get stuck. I cant understand how the second insert gets it's values.

Is there anyone out there who can help me out with this?

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