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- 1 PRIMARY a ref series_id series_id 4 const 87 Using temporary; Using filesort
- 1 PRIMARY <derived2> ALL NULL NULL NULL NULL 106
- 2 DERIVED r1 ALL identifier NULL NULL NULL 22576 Using temporary; Using filesort
- 2 DERIVED participants eq_ref PRIMARY PRIMARY 4 surveys.r1.identifier 1 Using where
- 2 DERIVED r2 ref identifier identifier 34 surveys.r1.identifier 34 Using where
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