Query time 0.00066
JSON explain
{
"query_block": {
"select_id": 1,
"cost_info": {
"query_cost": "230.41"
},
"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": 32,
"rows_produced_per_join": 32,
"filtered": "100.00",
"index_condition": "((`portal`.`q_discussion`.`object_id` in (13593,13601,14240,14241,14242,14243,14244,14245,14246,14247,14248,14249,14250,14251,14252,14253,14254,14255,14256,14257,14258,14259,14260,14261,14263,14264,14265,14266,14267,14268,14269,14270)) and (`portal`.`q_discussion`.`object_type` = 'P'))",
"cost_info": {
"read_cost": "70.41",
"eval_cost": "6.40",
"prefix_cost": "76.81",
"data_read_per_join": "512"
},
"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": 64,
"filtered": "100.00",
"cost_info": {
"read_cost": "64.00",
"eval_cost": "12.80",
"prefix_cost": "153.61",
"data_read_per_join": "28K"
},
"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": 64,
"filtered": "100.00",
"cost_info": {
"read_cost": "64.00",
"eval_cost": "12.80",
"prefix_cost": "230.41",
"data_read_per_join": "1024"
},
"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 |
13593 |
|
B |
13098 |
13601 |
|
B |
13081 |
14240 |
|
B |
12436 |
14241 |
|
B |
12437 |
14242 |
|
B |
12438 |
14243 |
|
B |
12440 |
14244 |
|
B |
12442 |
14245 |
|
B |
12443 |
14246 |
|
B |
12444 |
14247 |
|
B |
12445 |
14248 |
|
B |
12446 |
14249 |
|
B |
12447 |
14250 |
|
B |
12449 |
14251 |
|
B |
12450 |
14252 |
|
B |
12451 |
14253 |
|
B |
12453 |
14254 |
|
B |
12513 |
14255 |
|
B |
12454 |
14256 |
|
B |
12456 |
14257 |
|
B |
12457 |
14258 |
|
B |
12459 |
14259 |
|
B |
12460 |
14260 |
|
B |
12461 |
14261 |
|
B |
12462 |
14263 |
|
B |
12464 |
14264 |
|
B |
12465 |
14265 |
|
B |
12467 |
14266 |
|
B |
12468 |
14267 |
|
B |
12470 |
14268 |
|
B |
12471 |
14269 |
|
B |
12472 |
14270 |
|
B |
12473 |