Query time 0.00069
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 (16250,16253,16257,16259,16260,16263,16266,16267,16268,16269,16270,16271,16274,16275,16295,16296,16299,16300,16302,16303,16304,16305,16306,16310,16311,16312,16313,16314,16315,16316)) 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 |
16250 |
|
B |
8676 |
16253 |
|
B |
8684 |
16257 |
|
B |
8693 |
16259 |
|
B |
8694 |
16260 |
|
B |
8696 |
16263 |
|
B |
8701 |
16266 |
|
B |
8568 |
16267 |
|
B |
8571 |
16268 |
|
B |
8572 |
16269 |
|
B |
8574 |
16270 |
|
B |
8575 |
16271 |
|
B |
8576 |
16274 |
|
B |
8583 |
16275 |
|
B |
8585 |
16295 |
|
B |
8623 |
16296 |
|
B |
8627 |
16299 |
|
B |
8632 |
16300 |
|
B |
8633 |
16302 |
|
B |
8636 |
16303 |
|
B |
8638 |
16304 |
|
B |
8707 |
16305 |
|
B |
8709 |
16306 |
|
B |
8711 |
16310 |
|
B |
8644 |
16311 |
|
B |
8640 |
16312 |
|
B |
8548 |
16313 |
|
B |
8549 |
16314 |
|
B |
8550 |
16315 |
|
B |
8551 |
16316 |
|
B |
8552 |