concat中的mysql子查詢

Question

我有以下查詢和文件，並且工作正常。

是否可以對product_id字段（從名稱為'car'的產品中選擇SELECT ID）進行子查詢，我該如何實現？

文件：

postcode;huisnummer;toevoeging;product;datum
1775 BB;4;;CAR;02-01-2018

查詢：

LOAD DATA LOCAL INFILE '$path' 
INTO TABLE `temp_loc` 
FIELDS TERMINATED BY ';' 
OPTIONALLY ENCLOSED BY '"' 
IGNORE 1 LINES 
(@postcode,@huisnummer,@toevoeging,product,datum)
SET adres = CONCAT(REPLACE(@postcode, ' ', ''),'', @huisnummer,'$',@toevoeging);

數據庫列：

merged_adres , product_id, datum

Answer 1

回答：

LOAD DATA LOCAL INFILE '$path' 
INTO TABLE `temp_loc` 
FIELDS TERMINATED BY ';' 
OPTIONALLY ENCLOSED BY '"' 
IGNORE 1 LINES 
(@postcode,@huisnummer,@toevoeging,@product,datum)
SET adres = CONCAT(REPLACE(@postcode, ' ', ''),'', @huisnummer,'$',@toevoeging),
product = (SELECT id FROM products WHERE name = @product);