Query time 0.00092
JSON explain
{
"query_block": {
"select_id": 1,
"cost_info": {
"query_cost": "58.65"
},
"ordering_operation": {
"using_filesort": true,
"grouping_operation": {
"using_temporary_table": true,
"using_filesort": false,
"nested_loop": [
{
"table": {
"table_name": "PC",
"access_type": "ref",
"possible_keys": [
"PRIMARY",
"link_type",
"pt",
"idx_pc_product_id_type"
],
"key": "link_type",
"used_key_parts": [
"link_type",
"category_id"
],
"key_length": "6",
"ref": [
"const",
"const"
],
"rows_examined_per_scan": 39,
"rows_produced_per_join": 39,
"filtered": "100.00",
"using_index": true,
"cost_info": {
"read_cost": "0.26",
"eval_cost": "3.90",
"prefix_cost": "4.16",
"data_read_per_join": "624"
},
"used_columns": [
"product_id",
"category_id",
"link_type"
]
}
},
{
"table": {
"table_name": "P",
"access_type": "eq_ref",
"possible_keys": [
"PRIMARY",
"status",
"cscart_products_brand_id_index",
"cscart_products_product_id_index",
"idx_status"
],
"key": "PRIMARY",
"used_key_parts": [
"product_id"
],
"key_length": "3",
"ref": [
"dev2.PC.product_id"
],
"rows_examined_per_scan": 1,
"rows_produced_per_join": 28,
"filtered": "72.23",
"cost_info": {
"read_cost": "9.75",
"eval_cost": "2.82",
"prefix_cost": "17.81",
"data_read_per_join": "212K"
},
"used_columns": [
"product_id",
"status",
"brand_id"
],
"attached_condition": "((`dev2`.`P`.`status` = 'A') and (`dev2`.`P`.`brand_id` is not null))"
}
},
{
"table": {
"table_name": "B",
"access_type": "eq_ref",
"possible_keys": [
"PRIMARY",
"cscart_brands_pk2"
],
"key": "PRIMARY",
"used_key_parts": [
"brand_id"
],
"key_length": "4",
"ref": [
"dev2.P.brand_id"
],
"rows_examined_per_scan": 1,
"rows_produced_per_join": 28,
"filtered": "100.00",
"cost_info": {
"read_cost": "7.04",
"eval_cost": "2.82",
"prefix_cost": "27.67",
"data_read_per_join": "96K"
},
"used_columns": [
"brand_id",
"brand"
]
}
},
{
"table": {
"table_name": "BR",
"access_type": "eq_ref",
"possible_keys": [
"unique_brand_category",
"idx_br_brand_category"
],
"key": "unique_brand_category",
"used_key_parts": [
"brand_id",
"category_id"
],
"key_length": "8",
"ref": [
"dev2.P.brand_id",
"const"
],
"rows_examined_per_scan": 1,
"rows_produced_per_join": 28,
"filtered": "100.00",
"cost_info": {
"read_cost": "28.17",
"eval_cost": "2.82",
"prefix_cost": "58.65",
"data_read_per_join": "901"
},
"used_columns": [
"id",
"brand_id",
"category_id",
"current_position"
],
"attached_condition": "<if>(is_not_null_compl(BR), (`dev2`.`BR`.`current_position` > 0), true)"
}
}
]
}
}
}
}
Result
brand_id |
brand |
current_position |
category_id |
2312 |
ГАЗ |
|
712 |
2461 |
КАМАЗ |
|
712 |
2950 |
УРАЛ |
|
712 |
2951 |
УРАЛ СПЕЦ ТРАКТ |
|
712 |