Query time 0.00095
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 (801,802,1091,658,1517,671,1561,1581,630,627,666,674)) 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 |
627 |
|
B |
2632 |
630 |
|
B |
2635 |
658 |
|
B |
2663 |
666 |
|
B |
2671 |
671 |
|
B |
2676 |
674 |
|
B |
2679 |
801 |
|
B |
2806 |
802 |
|
B |
2807 |
1091 |
|
B |
3100 |
1517 |
|
B |
3528 |
1561 |
|
B |
3575 |
1581 |
|
B |
3595 |