Query time 0.00053
JSON explain
{
"query_block": {
"select_id": 1,
"cost_info": {
"query_cost": "138.01"
},
"grouping_operation": {
"using_filesort": false,
"nested_loop": [
{
"table": {
"table_name": "cscart_discussion",
"access_type": "range",
"possible_keys": [
"object_id"
],
"key": "object_id",
"used_key_parts": [
"object_id",
"object_type"
],
"key_length": "7",
"rows_examined_per_scan": 30,
"rows_produced_per_join": 30,
"filtered": "100.00",
"index_condition": "((`ea201_diorama`.`cscart_discussion`.`object_id` in (31135,40732,40733,40537,40538,40539,38833,32125,38832,38830,38831,39074,38180,38181,38794,31134,31136,31139,31140,31141,31144,31145,31153,31155)) and (`ea201_diorama`.`cscart_discussion`.`object_type` = 'P'))",
"cost_info": {
"read_cost": "60.01",
"eval_cost": "6.00",
"prefix_cost": "66.01",
"data_read_per_join": "720"
},
"used_columns": [
"thread_id",
"object_id",
"object_type",
"type"
]
}
},
{
"table": {
"table_name": "cscart_discussion_posts",
"access_type": "ref",
"possible_keys": [
"thread_id",
"thread_id_2"
],
"key": "thread_id",
"used_key_parts": [
"thread_id"
],
"key_length": "4",
"ref": [
"ea201_diorama.cscart_discussion.thread_id"
],
"rows_examined_per_scan": 1,
"rows_produced_per_join": 30,
"filtered": "100.00",
"cost_info": {
"read_cost": "30.00",
"eval_cost": "6.00",
"prefix_cost": "102.01",
"data_read_per_join": "13K"
},
"used_columns": [
"post_id",
"thread_id",
"status"
],
"attached_condition": "<if>(is_not_null_compl(cscart_discussion_posts), ((`ea201_diorama`.`cscart_discussion_posts`.`thread_id` = `ea201_diorama`.`cscart_discussion`.`thread_id`) and (`ea201_diorama`.`cscart_discussion_posts`.`status` = 'A')), true)"
}
},
{
"table": {
"table_name": "cscart_discussion_rating",
"access_type": "eq_ref",
"possible_keys": [
"PRIMARY",
"thread_id"
],
"key": "PRIMARY",
"used_key_parts": [
"post_id"
],
"key_length": "3",
"ref": [
"ea201_diorama.cscart_discussion_posts.post_id"
],
"rows_examined_per_scan": 1,
"rows_produced_per_join": 30,
"filtered": "100.00",
"cost_info": {
"read_cost": "30.00",
"eval_cost": "6.00",
"prefix_cost": "138.01",
"data_read_per_join": "480"
},
"used_columns": [
"rating_value",
"post_id",
"thread_id"
],
"attached_condition": "<if>(is_not_null_compl(cscart_discussion_rating), ((`ea201_diorama`.`cscart_discussion_rating`.`thread_id` = `ea201_diorama`.`cscart_discussion`.`thread_id`) and (`ea201_diorama`.`cscart_discussion_rating`.`rating_value` <> 0)), true)"
}
}
]
}
}
}
Result
product_id |
average_rating |
discussion_type |
discussion_thread_id |
31134 |
|
D |
4148 |
31135 |
|
D |
328 |
31136 |
|
D |
3781 |
31139 |
|
D |
89 |
31140 |
|
D |
66 |
31141 |
|
D |
67 |
31144 |
|
D |
69 |
31145 |
|
D |
88 |
31153 |
|
D |
4594 |
31155 |
|
D |
1959 |
32125 |
|
B |
2754 |
38180 |
|
D |
15037 |
38181 |
|
D |
15038 |
38794 |
|
D |
21084 |
38830 |
|
D |
22084 |
38831 |
|
D |
22085 |
38832 |
|
D |
22086 |
38833 |
|
D |
22087 |
39074 |
|
D |
25978 |
40537 |
|
D |
36949 |
40538 |
|
D |
36950 |
40539 |
|
D |
36951 |
40732 |
|
D |
37214 |
40733 |
|
D |
37215 |