Query time 0.00054
JSON explain
{
"query_block": {
"select_id": 1,
"cost_info": {
"query_cost": "137.21"
},
"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": 29,
"rows_produced_per_join": 29,
"filtered": "100.00",
"index_condition": "((`ea201_diorama`.`cscart_discussion`.`object_id` in (40706,39407,40230,31724,39680,39404,39401,39406,39405,39144,39403,40778,31725,31727,30418,30420,30413,30414,30415,30416,30417,30421,30423,31732,39408,39409,39410)) and (`ea201_diorama`.`cscart_discussion`.`object_type` = 'P'))",
"cost_info": {
"read_cost": "61.81",
"eval_cost": "5.80",
"prefix_cost": "67.61",
"data_read_per_join": "696"
},
"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": 29,
"filtered": "100.00",
"cost_info": {
"read_cost": "29.00",
"eval_cost": "5.80",
"prefix_cost": "102.41",
"data_read_per_join": "12K"
},
"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": 29,
"filtered": "100.00",
"cost_info": {
"read_cost": "29.00",
"eval_cost": "5.80",
"prefix_cost": "137.21",
"data_read_per_join": "464"
},
"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 |
30413 |
|
D |
119 |
30414 |
|
D |
120 |
30415 |
|
D |
121 |
30416 |
|
D |
122 |
30417 |
|
D |
123 |
30418 |
|
D |
115 |
30420 |
|
D |
117 |
30421 |
|
D |
118 |
30423 |
|
D |
113 |
31724 |
|
B |
2783 |
31725 |
|
D |
21804 |
31727 |
|
D |
4348 |
31732 |
|
D |
2598 |
39144 |
|
D |
26821 |
39401 |
|
D |
30846 |
39403 |
|
D |
30848 |
39404 |
|
D |
30849 |
39405 |
|
D |
30850 |
39406 |
|
D |
30851 |
39407 |
|
D |
30852 |
39408 |
|
D |
30854 |
39409 |
|
D |
30855 |
39410 |
|
D |
30856 |
39680 |
|
D |
30660 |
40230 |
|
D |
41089 |
40706 |
|
D |
37182 |
40778 |
|
D |
37280 |