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 (30355,30359,30387,30392,30393,30399,30401,30402,30403,30406,30407,30668,30671,30672,30675,30676,30682,30686,30694,30695,30699,30701,30702,30704,30705,30707,30708,30711,30712,30713)) 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 |
30355 |
|
B |
22980 |
30359 |
|
B |
22974 |
30387 |
|
B |
22925 |
30392 |
|
B |
22917 |
30393 |
|
B |
22914 |
30399 |
|
B |
22905 |
30401 |
|
B |
22901 |
30402 |
|
B |
22900 |
30403 |
|
B |
22898 |
30406 |
|
B |
23051 |
30407 |
|
B |
23048 |
30668 |
|
B |
23010 |
30671 |
|
B |
23005 |
30672 |
|
B |
23004 |
30675 |
|
B |
22998 |
30676 |
|
B |
22997 |
30682 |
|
B |
22991 |
30686 |
|
B |
22984 |
30694 |
|
B |
23118 |
30695 |
|
B |
23116 |
30699 |
|
B |
23109 |
30701 |
|
B |
23107 |
30702 |
|
B |
23106 |
30704 |
|
B |
22259 |
30705 |
|
B |
22256 |
30707 |
|
B |
22250 |
30708 |
|
B |
22247 |
30711 |
|
B |
22241 |
30712 |
|
B |
22240 |
30713 |
|
B |
23105 |