Query time 0.00057
JSON explain
{
"query_block": {
"select_id": 1,
"cost_info": {
"query_cost": "9.03"
},
"grouping_operation": {
"using_filesort": false,
"nested_loop": [
{
"table": {
"table_name": "p",
"access_type": "range",
"possible_keys": [
"PRIMARY"
],
"key": "PRIMARY",
"used_key_parts": [
"product_id"
],
"key_length": "3",
"rows_examined_per_scan": 2,
"rows_produced_per_join": 2,
"filtered": "100.00",
"using_index": true,
"cost_info": {
"read_cost": "1.43",
"eval_cost": "0.40",
"prefix_cost": "1.83",
"data_read_per_join": "11K"
},
"used_columns": [
"product_id"
],
"attached_condition": "(`portal`.`p`.`product_id` in (7772,7774))"
}
},
{
"table": {
"table_name": "q_discussion",
"access_type": "eq_ref",
"possible_keys": [
"PRIMARY",
"object_id"
],
"key": "object_id",
"used_key_parts": [
"object_id",
"object_type"
],
"key_length": "6",
"ref": [
"portal.p.product_id",
"const"
],
"rows_examined_per_scan": 1,
"rows_produced_per_join": 2,
"filtered": "100.00",
"cost_info": {
"read_cost": "2.00",
"eval_cost": "0.40",
"prefix_cost": "4.23",
"data_read_per_join": "32"
},
"used_columns": [
"thread_id",
"object_id",
"object_type"
]
}
},
{
"table": {
"table_name": "dp",
"access_type": "ref",
"possible_keys": [
"thread_id",
"thread_id_2"
],
"key": "thread_id",
"used_key_parts": [
"thread_id"
],
"key_length": "3",
"ref": [
"portal.q_discussion.thread_id"
],
"rows_examined_per_scan": 2,
"rows_produced_per_join": 0,
"filtered": "10.00",
"cost_info": {
"read_cost": "4.00",
"eval_cost": "0.08",
"prefix_cost": "9.03",
"data_read_per_join": "179"
},
"used_columns": [
"post_id",
"thread_id",
"status"
],
"attached_condition": "(`portal`.`dp`.`status` = 'A')"
}
}
]
}
}
}