Query time 0.00093
JSON explain
{
"query_block": {
"select_id": 1,
"cost_info": {
"query_cost": "14.73"
},
"nested_loop": [
{
"table": {
"table_name": "cscart_orders",
"access_type": "index_merge",
"possible_keys": [
"PRIMARY",
"user_id",
"status"
],
"key": "intersect(status,user_id)",
"key_length": "3,3",
"rows_examined_per_scan": 13,
"rows_produced_per_join": 13,
"filtered": "93.95",
"cost_info": {
"read_cost": "4.33",
"eval_cost": "1.30",
"prefix_cost": "5.63",
"data_read_per_join": "134K"
},
"used_columns": [
"order_id",
"user_id",
"status"
],
"attached_condition": "(((`cscartdb`.`cscart_orders`.`user_id` = 0) and (`cscartdb`.`cscart_orders`.`status` = 'C')) and (`cscartdb`.`cscart_orders`.`order_id` is not null))"
}
},
{
"table": {
"table_name": "cscart_order_details",
"access_type": "ref",
"possible_keys": [
"o_k"
],
"key": "o_k",
"used_key_parts": [
"order_id"
],
"key_length": "3",
"ref": [
"cscartdb.cscart_orders.order_id"
],
"rows_examined_per_scan": 2,
"rows_produced_per_join": 5,
"filtered": "20.00",
"index_condition": "(`cscartdb`.`cscart_order_details`.`product_id` in (5689,5690))",
"cost_info": {
"read_cost": "6.50",
"eval_cost": "0.52",
"prefix_cost": "14.73",
"data_read_per_join": "1K"
},
"used_columns": [
"item_id",
"order_id",
"product_id"
]
}
}
]
}
}
Result
COUNT(cscart_order_details.item_id) |
0 |