Query time 0.00123
JSON explain
{
"query_block": {
"select_id": 1,
"cost_info": {
"query_cost": "868.95"
},
"ordering_operation": {
"using_filesort": true,
"grouping_operation": {
"using_temporary_table": true,
"using_filesort": false,
"nested_loop": [
{
"table": {
"table_name": "c",
"access_type": "range",
"possible_keys": [
"PRIMARY",
"id_path",
"p_category_id"
],
"key": "id_path",
"used_key_parts": [
"id_path"
],
"key_length": "767",
"rows_examined_per_scan": 1,
"rows_produced_per_join": 1,
"filtered": "100.00",
"index_condition": "(`cscartdb`.`c`.`id_path` like '828/%')",
"cost_info": {
"read_cost": "0.61",
"eval_cost": "0.10",
"prefix_cost": "0.71",
"data_read_per_join": "3K"
},
"used_columns": [
"category_id",
"id_path"
]
}
},
{
"table": {
"table_name": "d",
"access_type": "ref",
"possible_keys": [
"PRIMARY"
],
"key": "PRIMARY",
"used_key_parts": [
"category_id"
],
"key_length": "3",
"ref": [
"cscartdb.c.category_id"
],
"rows_examined_per_scan": 13,
"rows_produced_per_join": 13,
"filtered": "100.00",
"cost_info": {
"read_cost": "3.25",
"eval_cost": "1.30",
"prefix_cost": "5.26",
"data_read_per_join": "39K"
},
"used_columns": [
"category_id",
"category"
]
}
},
{
"table": {
"table_name": "p",
"access_type": "ref",
"possible_keys": [
"PRIMARY"
],
"key": "PRIMARY",
"used_key_parts": [
"category_id"
],
"key_length": "3",
"ref": [
"cscartdb.c.category_id"
],
"rows_examined_per_scan": 623,
"rows_produced_per_join": 8099,
"filtered": "100.00",
"using_index": true,
"cost_info": {
"read_cost": "53.79",
"eval_cost": "809.90",
"prefix_cost": "868.95",
"data_read_per_join": "126K"
},
"used_columns": [
"product_id",
"category_id"
]
}
}
]
}
}
}
}