Query time 0.00127
JSON explain
{
"query_block": {
"select_id": 1,
"cost_info": {
"query_cost": "63.21"
},
"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": 14,
"rows_produced_per_join": 14,
"filtered": "100.00",
"index_condition": "((`ea201_diorama`.`cscart_discussion`.`object_id` in (38143,39094,40172,30191,35740,36481,30190,30173,30193,30171)) and (`ea201_diorama`.`cscart_discussion`.`object_type` = 'P'))",
"cost_info": {
"read_cost": "26.81",
"eval_cost": "2.80",
"prefix_cost": "29.61",
"data_read_per_join": "336"
},
"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": 14,
"filtered": "100.00",
"cost_info": {
"read_cost": "14.00",
"eval_cost": "2.80",
"prefix_cost": "46.41",
"data_read_per_join": "6K"
},
"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": 14,
"filtered": "100.00",
"cost_info": {
"read_cost": "14.00",
"eval_cost": "2.80",
"prefix_cost": "63.21",
"data_read_per_join": "224"
},
"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 |
30171 |
|
D |
3335 |
30173 |
|
D |
965 |
30190 |
|
D |
980 |
30191 |
|
D |
1358 |
30193 |
|
D |
1359 |
35740 |
|
D |
7209 |
36481 |
|
D |
9664 |
38143 |
|
D |
14815 |
39094 |
|
D |
26320 |
40172 |
|
B |
32508 |