Query time 0.00060
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 (29195,29201,29203,29211,29212,29213,29215,29216,29223,29225,29227,29230,29233,29237,29239,29242,29243,29244,29251,29252,29257,29258,29260,29270,29275,29284,29286,29288,29289,29290)) 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 |
29195 |
|
B |
20071 |
29201 |
|
B |
20056 |
29203 |
|
B |
20052 |
29211 |
|
B |
20039 |
29212 |
|
B |
20034 |
29213 |
|
B |
20033 |
29215 |
|
B |
20029 |
29216 |
|
B |
20027 |
29223 |
|
B |
20014 |
29225 |
|
B |
20010 |
29227 |
|
B |
20007 |
29230 |
|
B |
20005 |
29233 |
|
B |
20001 |
29237 |
|
B |
19991 |
29239 |
|
B |
19988 |
29242 |
|
B |
19982 |
29243 |
|
B |
19981 |
29244 |
|
B |
20118 |
29251 |
|
B |
20099 |
29252 |
|
B |
20095 |
29257 |
|
B |
20087 |
29258 |
|
B |
20086 |
29260 |
|
B |
20081 |
29270 |
|
B |
20231 |
29275 |
|
B |
20220 |
29284 |
|
B |
20203 |
29286 |
|
B |
20198 |
29288 |
|
B |
20195 |
29289 |
|
B |
20193 |
29290 |
|
B |
20191 |