Query time 0.00134
JSON explain
{
"query_block": {
"select_id": 1,
"cost_info": {
"query_cost": "20.96"
},
"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": 12,
"rows_produced_per_join": 12,
"filtered": "100.00",
"using_index": true,
"cost_info": {
"read_cost": "3.44",
"eval_cost": "2.40",
"prefix_cost": "5.84",
"data_read_per_join": "9K"
},
"used_columns": [
"feature_id",
"product_id",
"variant_id",
"lang_code"
],
"attached_condition": "((`webmarco`.`pfv`.`feature_id` in (932,897)) and (`webmarco`.`pfv`.`product_id` in (262359,262367,262370,262376,262380,262391)) 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": "12.00",
"eval_cost": "0.12",
"prefix_cost": "20.24",
"data_read_per_join": "700"
},
"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": "0.60",
"eval_cost": "0.12",
"prefix_cost": "20.96",
"data_read_per_join": "2K"
},
"used_columns": [
"variant_id",
"variant",
"lang_code"
]
}
}
]
}
}
Result
feature_id |
product_id |
variant_id |
position |
variant |
897 |
262376 |
62221 |
0 |
101 |
897 |
262380 |
62223 |
0 |
103 |
897 |
262391 |
62228 |
0 |
108 |
932 |
262359 |
63589 |
0 |
V1 |
932 |
262367 |
63591 |
0 |
V3 |
932 |
262370 |
63593 |
0 |
V5 |