; { "index": "PRIMARY", "usable": false, "cause": "not_applicable" }, { "index": "idx_nap", "usable": true, "key_parts": [ "name", "age", "pos", "id" ] } ], "setup_range_conditions": [ ], "group_index_range": { "chosen": false, "cause": "not_group_by_or_distinct" }, "analyzing_range_alternatives": { "range_scan_alternatives": [ { "index": "idx_nap", "ranges": [ "July <= name <= July AND 23 <= age <= 23" ], "index_dives_for_eq_ranges": true, "rowid_ordered": false, "using_mrr": false, "index_only": false, "rows": 13, &n |