Query time 0.00130
JSON explain
{
"query_block": {
"select_id": 1,
"cost_info": {
"query_cost": "52.81"
},
"grouping_operation": {
"using_filesort": false,
"nested_loop": [
{
"table": {
"table_name": "cscart_discussion",
"access_type": "range",
"possible_keys": [
"object_id",
"company_id"
],
"key": "object_id",
"used_key_parts": [
"object_id",
"object_type",
"company_id"
],
"key_length": "10",
"rows_examined_per_scan": 11,
"rows_produced_per_join": 11,
"filtered": "100.00",
"index_condition": "((`eshopuga_upgr_4122`.`cscart_discussion`.`company_id` = 1) and (`eshopuga_upgr_4122`.`cscart_discussion`.`object_id` in (645,655,675,676,846,1056,1068,1131,1590,1715,1822)) and (`eshopuga_upgr_4122`.`cscart_discussion`.`object_type` = 'P'))",
"cost_info": {
"read_cost": "24.21",
"eval_cost": "2.20",
"prefix_cost": "26.41",
"data_read_per_join": "264"
},
"used_columns": [
"thread_id",
"object_id",
"object_type",
"type",
"company_id"
]
}
},
{
"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": "3",
"ref": [
"eshopuga_upgr_4122.cscart_discussion.thread_id"
],
"rows_examined_per_scan": 1,
"rows_produced_per_join": 11,
"filtered": "100.00",
"cost_info": {
"read_cost": "11.00",
"eval_cost": "2.20",
"prefix_cost": "39.61",
"data_read_per_join": "4K"
},
"used_columns": [
"post_id",
"thread_id",
"status"
],
"attached_condition": "<if>(is_not_null_compl(cscart_discussion_posts), (`eshopuga_upgr_4122`.`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": [
"eshopuga_upgr_4122.cscart_discussion_posts.post_id"
],
"rows_examined_per_scan": 1,
"rows_produced_per_join": 11,
"filtered": "100.00",
"cost_info": {
"read_cost": "11.00",
"eval_cost": "2.20",
"prefix_cost": "52.81",
"data_read_per_join": "176"
},
"used_columns": [
"rating_value",
"post_id",
"thread_id"
],
"attached_condition": "<if>(is_not_null_compl(cscart_discussion_rating), ((`eshopuga_upgr_4122`.`cscart_discussion_rating`.`thread_id` = `eshopuga_upgr_4122`.`cscart_discussion`.`thread_id`) and (`eshopuga_upgr_4122`.`cscart_discussion_rating`.`rating_value` <> 0)), true)"
}
}
]
}
}
}
Result
product_id |
average_rating |
discussion_type |
discussion_thread_id |
645 |
|
B |
2650 |
655 |
|
B |
2660 |
675 |
|
B |
2680 |
676 |
|
B |
2681 |
846 |
|
B |
2852 |
1056 |
|
B |
3065 |
1068 |
|
B |
3077 |
1131 |
|
B |
3140 |
1590 |
|
B |
3605 |
1715 |
|
B |
3730 |
1822 |
|
B |
3837 |