http://www.viewpoint.asb-digital.fr/product/zebrafish/fish-behavior-monitoring/zebratower

id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE p1_ ref PRIMARY, IDX_11A8C6944584665A, IDX_11A8C6942B200B63 IDX_11A8C6944584665A 4 const 3 100.00 Using index; Using temporary; Using filesort
1 SIMPLE p0_ ALL PRIMARY 3 33.33 Using where; Using join buffer (hash join)