concat中的mysql子查询

Question

我有以下查询和文件，并且工作正常。

是否可以对product_id字段（从名称为'car'的产品中选择SELECT ID）进行子查询，我该如何实现？

文件：

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

查询：

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);

数据库列：

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);