{
"query_block": {
"select_id": 1,
"cost_info": {
"query_cost": "4.80"
},
"table": {
"table_name": "q_categories",
"access_type": "ref",
"possible_keys": [
"parent"
],
"key": "parent",
"used_key_parts": [
"parent_id"
],
"key_length": "3",
"ref": [
"const"
],
"rows_examined_per_scan": 4,
"rows_produced_per_join": 4,
"filtered": "100.00",
"cost_info": {
"read_cost": "4.00",
"eval_cost": "0.80",
"prefix_cost": "4.80",
"data_read_per_join": "10K"
},
"used_columns": [
"category_id",
"parent_id"
]
}
}
}
category_id | parent_id |
---|---|
353 | 352 |
354 | 352 |
355 | 352 |
356 | 352 |
357 | 352 |