mysql - Select 1 row multiple time if has more then 1 value in other column -

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i have database structure. issue table complex (typo3).

i simplify this:

|     id   |cat  |  |==========|=====| |1         |44,15| |2         |16   | |3         |29,30|

what want have result 1 row each category (cat), mean

1 44 1 15 2 16 3 29 3 30

i tried use simple select of course not work.

i tried use left join table category using category.id in (table1.cat)

1.: db structure bad! not first normal form (1nf), because have array in column string representation.

2.: it's not tricky.

some inspiration: http://blog.fedecarg.com/2009/02/22/mysql-split-string-function/ or here: http://dev.mysql.com/doc/refman/5.5/en/string-functions.html#function_substring-index


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