Query time 0.00072
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 (29790,29793,29794,29796,29800,29801,29806,29813,29818,29825,29829,29832,29833,29834,29835,29836,29838,29843,29849,29850,29852,29854,29860,29862,29864,29876,29878,29904,29905,30349)) 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 |
29790 |
|
B |
21418 |
29793 |
|
B |
20680 |
29794 |
|
B |
20679 |
29796 |
|
B |
20674 |
29800 |
|
B |
20667 |
29801 |
|
B |
20666 |
29806 |
|
B |
20659 |
29813 |
|
B |
20649 |
29818 |
|
B |
20636 |
29825 |
|
B |
20627 |
29829 |
|
B |
20623 |
29832 |
|
B |
20792 |
29833 |
|
B |
20615 |
29834 |
|
B |
20613 |
29835 |
|
B |
20611 |
29836 |
|
B |
20609 |
29838 |
|
B |
20606 |
29843 |
|
B |
20772 |
29849 |
|
B |
20761 |
29850 |
|
B |
20757 |
29852 |
|
B |
20752 |
29854 |
|
B |
20746 |
29860 |
|
B |
20729 |
29862 |
|
B |
20724 |
29864 |
|
B |
20720 |
29876 |
|
B |
20696 |
29878 |
|
B |
20693 |
29904 |
|
B |
20816 |
29905 |
|
B |
20813 |
30349 |
|
B |
22323 |