Query time 0.00077
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 (13489,13494,13495,13500,13501,13502,13504,13506,14432,14448,14459,14460,14461,14462,14464,14465,14466,14467,14468,14469,14470,14471,14474,14498,14512,14513,14514,14518,14519,14520)) 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 |
13489 |
|
B |
12350 |
13494 |
|
B |
12304 |
13495 |
|
B |
12351 |
13500 |
|
B |
12355 |
13501 |
|
B |
12356 |
13502 |
|
B |
12357 |
13504 |
|
B |
12359 |
13506 |
|
B |
12361 |
14432 |
|
B |
12137 |
14448 |
|
B |
11990 |
14459 |
|
B |
12004 |
14460 |
|
B |
12005 |
14461 |
|
B |
12007 |
14462 |
|
B |
12204 |
14464 |
|
B |
12208 |
14465 |
|
B |
12210 |
14466 |
|
B |
12020 |
14467 |
|
B |
12021 |
14468 |
|
B |
12023 |
14469 |
|
B |
12025 |
14470 |
|
B |
22084 |
14471 |
|
B |
12027 |
14474 |
|
B |
12029 |
14498 |
|
B |
11912 |
14512 |
|
B |
11937 |
14513 |
|
B |
11938 |
14514 |
|
B |
11940 |
14518 |
|
B |
11946 |
14519 |
|
B |
11948 |
14520 |
|
B |
11949 |