技術標籤：MySQLmysql

拼接前查詢結果：

SQL語句：其中plate_essential是中間表

SELECT a.*, c.plate FROM stock_essential_data a
LEFT JOIN plate_essential b ON a.id = b.essential_id
LEFT JOIN stock_plate c ON b.plate_id = c.id

使用GROUP_CONCAT函式按欄位拼接結果

SELECT a.*,GROUP_CONCAT(c.plate separator'|') plate FROM stock_essential_data a
LEFT JOIN plate_essential b ON a.id = b.essential_id
LEFT JOIN stock_plate c ON b.plate_id = c.id
group by a.id
 

還能使用separator指定拼接符：GROUP_CONCAT(c.plateseparator'|')

SELECT a.*,GROUP_CONCAT(c.plate separator'|') plate FROM stock_essential_data a
LEFT JOIN plate_essential b ON a.id = b.essential_id
LEFT JOIN stock_plate c ON b.plate_id = c.id
group by a.id