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query optimisation when ref is null with explain
1 | simple | est | ref | clone,processed_seq | clone | 15 | triticum_aestivum.clone.name | 1 | using where | | 1 | simple | sequence | eq_ref | primary | primary | 20 | triticum_aestivum.est.processed_seq | 1 | using where | ...

ölpreis: boden erreicht, oder was????
autor: triticum_aestivum.