此查询显示＃1248 - 每个派生表必须具有自己的别名

Question

SELECT X.workorder_id,X.order_id FROM mr_workorder_data AS X 
    LEFT JOIN 
(SELECT order_id, workorder_id, GROUP_CONCAT(trim_id SEPARATOR '|') AS trim_id_arr 
   FROM mr_workorder_data 
          WHERE order_id = X.order_id AND workorder_id = 
X.workorder_id GROUP BY order_id) 
WHERE X.data_type = 'Accessories' GROUP BY X.workorder_id

Answer 1

你有一个左连接（subselect）没有别名add（例如:) T在子查询的末尾（）

  SELECT X.workorder_id,X.order_id 
  FROM mr_workorder_data AS X 
  LEFT JOIN (  SELECT order_id,workorder_id,
           GROUP_CONCAT(trim_id SEPARATOR '|') AS trim_id_arr 
  FROM mr_workorder_data 
  WHERE order_id = X.order_id AND workorder_id = X.workorder_id
  GROUP BY order_id   )  T 
  WHERE X.data_type = 'Accessories' 
  GROUP BY X.workorder_id