Query time 0.00059
JSON explain
{
"query_block": {
"select_id": 1,
"cost_info": {
"query_cost": "216.01"
},
"grouping_operation": {
"using_filesort": false,
"nested_loop": [
{
"table": {
"table_name": "q_discussion",
"access_type": "range",
"possible_keys": [
"object_id"
],
"key": "object_id",
"used_key_parts": [
"object_id",
"object_type"
],
"key_length": "6",
"rows_examined_per_scan": 30,
"rows_produced_per_join": 30,
"filtered": "100.00",
"index_condition": "((`portal`.`q_discussion`.`object_id` in (18685,13484,13499,13505,13507,13514,13517,13537,13553,13554,13555,13556,13573,13596,13599,13644,13683,13686,14366,14367,14370,14385,14399,14401,14403,14404,14405,14406,14418,14423)) and (`portal`.`q_discussion`.`object_type` = 'P'))",
"cost_info": {
"read_cost": "66.01",
"eval_cost": "6.00",
"prefix_cost": "72.01",
"data_read_per_join": "480"
},
"used_columns": [
"thread_id",
"object_id",
"object_type",
"type"
]
}
},
{
"table": {
"table_name": "q_discussion_posts",
"access_type": "ref",
"possible_keys": [
"thread_id",
"thread_id_2"
],
"key": "thread_id",
"used_key_parts": [
"thread_id"
],
"key_length": "3",
"ref": [
"portal.q_discussion.thread_id"
],
"rows_examined_per_scan": 2,
"rows_produced_per_join": 60,
"filtered": "100.00",
"cost_info": {
"read_cost": "60.00",
"eval_cost": "12.00",
"prefix_cost": "144.01",
"data_read_per_join": "26K"
},
"used_columns": [
"post_id",
"thread_id",
"status"
],
"attached_condition": "<if>(is_not_null_compl(q_discussion_posts), (`portal`.`q_discussion_posts`.`status` = 'A'), true)"
}
},
{
"table": {
"table_name": "q_discussion_rating",
"access_type": "eq_ref",
"possible_keys": [
"PRIMARY",
"thread_id"
],
"key": "PRIMARY",
"used_key_parts": [
"post_id"
],
"key_length": "3",
"ref": [
"portal.q_discussion_posts.post_id"
],
"rows_examined_per_scan": 1,
"rows_produced_per_join": 60,
"filtered": "100.00",
"cost_info": {
"read_cost": "60.00",
"eval_cost": "12.00",
"prefix_cost": "216.01",
"data_read_per_join": "960"
},
"used_columns": [
"rating_value",
"post_id",
"thread_id"
],
"attached_condition": "<if>(is_not_null_compl(q_discussion_rating), ((`portal`.`q_discussion_rating`.`thread_id` = `portal`.`q_discussion`.`thread_id`) and (`portal`.`q_discussion_rating`.`rating_value` <> 0)), true)"
}
}
]
}
}
}
Result
product_id |
average_rating |
discussion_type |
discussion_thread_id |
13484 |
|
B |
12348 |
13499 |
|
B |
12354 |
13505 |
|
B |
12360 |
13507 |
|
B |
12362 |
13514 |
|
B |
12533 |
13517 |
|
B |
12525 |
13537 |
|
B |
12476 |
13553 |
|
B |
12424 |
13554 |
|
B |
12422 |
13555 |
|
B |
12420 |
13556 |
|
B |
12417 |
13573 |
|
B |
13038 |
13596 |
|
B |
13093 |
13599 |
|
B |
13087 |
13683 |
|
B |
13024 |
14366 |
|
B |
12297 |
14367 |
|
B |
12298 |
14370 |
|
B |
12301 |
14385 |
|
B |
12174 |
14399 |
|
B |
12194 |
14401 |
|
B |
12196 |
14403 |
|
B |
12085 |
14404 |
|
B |
12086 |
14405 |
|
B |
12087 |
14406 |
|
B |
12089 |
14418 |
|
B |
12113 |
14423 |
|
B |
12123 |
18685 |
|
B |
12340 |