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i think, thats code = w.code compared to having the same row value from the first table wands w and table wands in sub query.
and w.code=w.code and w.power=w.power does not work cause it compares for itself
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i think, thats code = w.code compared to having the same row value from the first table wands w and table wands in sub query. and w.code=w.code and w.power=w.power does not work cause it compares for itself