{
"query_block": {
"select_id": 1,
"cost_info": {
"query_cost": "1.07"
},
"nested_loop": [
{
"table": {
"table_name": "PC",
"access_type": "ref",
"possible_keys": [
"PRIMARY",
"pt",
"idx_pc_product_id_type"
],
"key": "pt",
"used_key_parts": [
"product_id"
],
"key_length": "3",
"ref": [
"const"
],
"rows_examined_per_scan": 1,
"rows_produced_per_join": 1,
"filtered": "100.00",
"using_index": true,
"cost_info": {
"read_cost": "0.25",
"eval_cost": "0.10",
"prefix_cost": "0.35",
"data_read_per_join": "16"
},
"used_columns": [
"product_id",
"category_id"
],
"attached_condition": "(`dev2`.`PC`.`category_id` is not null)"
}
},
{
"table": {
"table_name": "C",
"access_type": "eq_ref",
"possible_keys": [
"PRIMARY",
"p_category_id"
],
"key": "PRIMARY",
"used_key_parts": [
"category_id"
],
"key_length": "3",
"ref": [
"dev2.PC.category_id"
],
"rows_examined_per_scan": 1,
"rows_produced_per_join": 1,
"filtered": "100.00",
"cost_info": {
"read_cost": "0.62",
"eval_cost": "0.10",
"prefix_cost": "1.07",
"data_read_per_join": "10K"
},
"used_columns": [
"category_id",
"amo"
]
}
}
]
}
}
amo |
---|
1 |