Query time 0.00342
JSON explain
{
"query_block": {
"select_id": 1,
"cost_info": {
"query_cost": "7.66"
},
"nested_loop": [
{
"table": {
"table_name": "pfv",
"access_type": "range",
"possible_keys": [
"PRIMARY",
"fl",
"variant_id",
"lang_code",
"product_id",
"fpl",
"idx_product_feature_variant_id"
],
"key": "lang_code",
"used_key_parts": [
"lang_code",
"feature_id",
"product_id"
],
"key_length": "12",
"rows_examined_per_scan": 4,
"rows_produced_per_join": 4,
"filtered": "100.00",
"using_index": true,
"cost_info": {
"read_cost": "1.82",
"eval_cost": "0.80",
"prefix_cost": "2.62",
"data_read_per_join": "3K"
},
"used_columns": [
"feature_id",
"product_id",
"variant_id",
"lang_code"
],
"attached_condition": "((`webmarco`.`pfv`.`product_id` = 264849) and (`webmarco`.`pfv`.`feature_id` in (549,649,882,939)) and (`webmarco`.`pfv`.`lang_code` = 'en'))"
}
},
{
"table": {
"table_name": "fv",
"access_type": "eq_ref",
"possible_keys": [
"PRIMARY",
"feature_id"
],
"key": "PRIMARY",
"used_key_parts": [
"variant_id"
],
"key_length": "3",
"ref": [
"webmarco.pfv.variant_id"
],
"rows_examined_per_scan": 1,
"rows_produced_per_join": 0,
"filtered": "5.00",
"cost_info": {
"read_cost": "4.00",
"eval_cost": "0.04",
"prefix_cost": "7.42",
"data_read_per_join": "233"
},
"used_columns": [
"variant_id",
"feature_id",
"position"
],
"attached_condition": "(`webmarco`.`fv`.`feature_id` = `webmarco`.`pfv`.`feature_id`)"
}
},
{
"table": {
"table_name": "fvd",
"access_type": "eq_ref",
"possible_keys": [
"PRIMARY"
],
"key": "PRIMARY",
"used_key_parts": [
"variant_id",
"lang_code"
],
"key_length": "9",
"ref": [
"webmarco.pfv.variant_id",
"const"
],
"rows_examined_per_scan": 1,
"rows_produced_per_join": 0,
"filtered": "100.00",
"cost_info": {
"read_cost": "0.20",
"eval_cost": "0.04",
"prefix_cost": "7.66",
"data_read_per_join": "924"
},
"used_columns": [
"variant_id",
"variant",
"lang_code"
]
}
}
]
}
}
Result
feature_id |
product_id |
variant_id |
position |
variant |
549 |
264849 |
1198 |
0 |
Green |
649 |
264849 |
62610 |
0 |
EU 38 |
882 |
264849 |
60416 |
0 |
Green |
939 |
264849 |
63937 |
0 |
36 |