Query time 0.00166
JSON explain
{
"query_block": {
"select_id": 1,
"cost_info": {
"query_cost": "61.40"
},
"grouping_operation": {
"using_filesort": false,
"nested_loop": [
{
"table": {
"table_name": "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": 24,
"rows_produced_per_join": 24,
"filtered": "100.00",
"index_condition": "((`goimagine`.`discussion`.`object_id` in (186231,109593,103373,193286,90945,168820,96320,90935,120747,98810,98813,98373,91613,98734,104426,91612,167731,109606,98342,155430,239125,133812,196685,168828)) and (`goimagine`.`discussion`.`object_type` = 'P'))",
"cost_info": {
"read_cost": "34.01",
"eval_cost": "2.40",
"prefix_cost": "36.41",
"data_read_per_join": "576"
},
"used_columns": [
"thread_id",
"object_id",
"object_type",
"type"
]
}
},
{
"table": {
"table_name": "discussion_posts",
"access_type": "ref",
"possible_keys": [
"thread_id",
"thread_id_2"
],
"key": "thread_id_2",
"used_key_parts": [
"thread_id",
"status"
],
"key_length": "6",
"ref": [
"goimagine.discussion.thread_id",
"const"
],
"rows_examined_per_scan": 1,
"rows_produced_per_join": 42,
"filtered": "100.00",
"using_index": true,
"cost_info": {
"read_cost": "6.00",
"eval_cost": "4.22",
"prefix_cost": "46.64",
"data_read_per_join": "18K"
},
"used_columns": [
"post_id",
"thread_id",
"status"
]
}
},
{
"table": {
"table_name": "discussion_rating",
"access_type": "eq_ref",
"possible_keys": [
"PRIMARY",
"thread_id"
],
"key": "PRIMARY",
"used_key_parts": [
"post_id"
],
"key_length": "3",
"ref": [
"goimagine.discussion_posts.post_id"
],
"rows_examined_per_scan": 1,
"rows_produced_per_join": 42,
"filtered": "100.00",
"cost_info": {
"read_cost": "10.55",
"eval_cost": "4.22",
"prefix_cost": "61.40",
"data_read_per_join": "674"
},
"used_columns": [
"rating_value",
"post_id",
"thread_id"
],
"attached_condition": "<if>(is_not_null_compl(discussion_rating), ((`goimagine`.`discussion_rating`.`thread_id` = `goimagine`.`discussion`.`thread_id`) and (`goimagine`.`discussion_rating`.`rating_value` <> 0)), true)"
}
}
]
}
}
}
Result
| product_id |
average_rating |
discussion_type |
discussion_thread_id |
| 90935 |
|
D |
633065 |
| 90945 |
|
D |
637855 |
| 91612 |
|
D |
652915 |
| 91613 |
|
D |
652916 |
| 96320 |
|
D |
702413 |
| 98342 |
|
D |
704565 |
| 98373 |
|
D |
704596 |
| 98734 |
|
D |
704971 |
| 98810 |
|
D |
705051 |
| 98813 |
|
D |
705055 |
| 103373 |
|
D |
731294 |
| 104426 |
|
D |
732396 |
| 109593 |
|
D |
746140 |
| 109606 |
|
D |
746153 |
| 120747 |
|
D |
776729 |
| 133812 |
|
D |
836909 |
| 155430 |
|
D |
1025113 |
| 167731 |
|
D |
1157178 |
| 168820 |
|
D |
1158367 |
| 168828 |
|
D |
1158375 |
| 186231 |
|
D |
1390128 |
| 193286 |
|
D |
1465808 |
| 196685 |
|
D |
1475181 |
| 239125 |
|
D |
2526678 |