Query time 0.00055
JSON explain
{
"query_block": {
"select_id": 1,
"cost_info": {
"query_cost": "170.61"
},
"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": 37,
"rows_produced_per_join": 37,
"filtered": "100.00",
"index_condition": "((`ea201_diorama`.`cscart_discussion`.`object_id` in (40826,40509,40510,38833,40495,35693,40431,38832,38830,38795,38569,40038,37005,40042,40043,40141,40140,38788,38831,39090,38875,32009,39089,40062,39441,39354,39353,36377,39385,39076)) and (`ea201_diorama`.`cscart_discussion`.`object_type` = 'P'))",
"cost_info": {
"read_cost": "74.41",
"eval_cost": "7.40",
"prefix_cost": "81.81",
"data_read_per_join": "888"
},
"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": 37,
"filtered": "100.00",
"cost_info": {
"read_cost": "37.00",
"eval_cost": "7.40",
"prefix_cost": "126.21",
"data_read_per_join": "16K"
},
"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": 37,
"filtered": "100.00",
"cost_info": {
"read_cost": "37.00",
"eval_cost": "7.40",
"prefix_cost": "170.61",
"data_read_per_join": "592"
},
"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 |
32009 |
|
D |
1389 |
35693 |
|
D |
6865 |
36377 |
|
D |
9921 |
37005 |
|
D |
20748 |
38569 |
|
D |
20586 |
38788 |
|
D |
21060 |
38795 |
|
D |
21085 |
38830 |
|
D |
22084 |
38831 |
|
D |
22085 |
38832 |
|
D |
22086 |
38833 |
|
D |
22087 |
38875 |
|
D |
22724 |
39076 |
|
D |
25982 |
39089 |
|
D |
26304 |
39090 |
|
D |
26306 |
39353 |
|
D |
27574 |
39354 |
|
D |
27575 |
39385 |
|
D |
27833 |
39441 |
|
D |
29718 |
40038 |
|
D |
31737 |
40042 |
|
D |
31762 |
40043 |
|
D |
31763 |
40062 |
|
D |
31841 |
40140 |
|
D |
32255 |
40141 |
|
D |
32256 |
40431 |
|
D |
36823 |
40495 |
|
D |
36872 |
40509 |
|
D |
36904 |
40510 |
|
D |
36905 |
40826 |
|
D |
37342 |