Query time 0.00073
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 (30864,30865,30866,30867,30868,30869,30870,30871,30872,30873,30874,30875,30876,30877,30878,30879,30880,30881,30882,30883,30884,30885,30886,30887,30888,30889,30890,30891,30892,30893,30894,30895)) 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 |
30864 |
|
B |
22612 |
30865 |
|
B |
22611 |
30866 |
|
B |
22610 |
30867 |
|
B |
22608 |
30868 |
|
B |
22606 |
30869 |
|
B |
22605 |
30870 |
|
B |
22603 |
30872 |
|
B |
22602 |
30873 |
|
B |
22601 |
30874 |
|
B |
22599 |
30875 |
|
B |
22598 |
30876 |
|
B |
22596 |
30877 |
|
B |
22591 |
30878 |
|
B |
22590 |
30879 |
|
B |
22575 |
30880 |
|
B |
22561 |
30881 |
|
B |
22555 |
30882 |
|
B |
23144 |
30883 |
|
B |
23143 |
30884 |
|
B |
23142 |
30885 |
|
B |
23141 |
30886 |
|
B |
23139 |
30887 |
|
B |
23138 |
30888 |
|
B |
23136 |
30889 |
|
B |
23134 |
30890 |
|
B |
23309 |
30891 |
|
B |
23306 |
30892 |
|
B |
23305 |
30893 |
|
B |
23301 |
30894 |
|
B |
23299 |
30895 |
|
B |
23298 |