Query time 0.00099
JSON explain
{
"query_block": {
"select_id": 1,
"cost_info": {
"query_cost": "57.61"
},
"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": 12,
"rows_produced_per_join": 12,
"filtered": "100.00",
"index_condition": "((`eshopuga_upgr_4122`.`cscart_discussion`.`company_id` = 1) and (`eshopuga_upgr_4122`.`cscart_discussion`.`object_id` in (886,367,1144,894,895,1189,421,918,891,327,326,1182)) and (`eshopuga_upgr_4122`.`cscart_discussion`.`object_type` = 'P'))",
"cost_info": {
"read_cost": "26.41",
"eval_cost": "2.40",
"prefix_cost": "28.81",
"data_read_per_join": "288"
},
"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": 12,
"filtered": "100.00",
"cost_info": {
"read_cost": "12.00",
"eval_cost": "2.40",
"prefix_cost": "43.21",
"data_read_per_join": "5K"
},
"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": 12,
"filtered": "100.00",
"cost_info": {
"read_cost": "12.00",
"eval_cost": "2.40",
"prefix_cost": "57.61",
"data_read_per_join": "192"
},
"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 |
326 |
|
B |
2328 |
327 |
4.0000 |
B |
2329 |
367 |
4.0000 |
B |
2369 |
421 |
|
B |
2426 |
886 |
|
B |
2893 |
891 |
|
B |
2898 |
894 |
|
B |
2901 |
895 |
|
B |
2902 |
918 |
|
B |
2925 |
1144 |
|
B |
3153 |
1182 |
|
B |
3191 |
1189 |
|
B |
3198 |