Question

以下更新查询无效，但内部的选择查询为：

UPDATE tb_alunos_detalhes A
SET A.ADTELALUNO = B.TEL
FROM B (
  SELECT ADID ID,
          (CASE
               WHEN `ADTELALUNO` <> '' THEN ( CONCAT(SUBSTRING_INDEX(SUBSTRING_INDEX(`ADTELALUNO`, ' ', 1), ' ', -1), ' 9-', SUBSTRING(SUBSTRING_INDEX(SUBSTRING_INDEX(`ADTELALUNO`, ' ', 2), ' ', 10),6,10)))
               ELSE ''
           END) TEL
   FROM tb_alunos_detalhes ) B
WHERE A.ADID = B.ID

它给了我以下错误：

意外的令牌。（靠近＆＃34;（＆＃34;在62位）发现了一个新的声明，但它与前一个声明之间没有分隔符。（在＆＃34; SELECT＆＃34;在67位）意外的标记。（近＆＃34;）＆＃34;在第381位）意外的标记。（在＆＃34; B＆＃34;在383位置附近）

我做错了什么？

Answer 1

您可能正在寻找像

这样的update-join语法

UPDATE tb_alunos_detalhes A
JOIN (
  SELECT ID,
          (CASE
               WHEN `ADTELALUNO` <> '' THEN ( CONCAT(SUBSTRING_INDEX(SUBSTRING_INDEX(`ADTELALUNO`, ' ', 1), ' ', -1), ' 9-', SUBSTRING(SUBSTRING_INDEX(SUBSTRING_INDEX(`ADTELALUNO`, ' ', 2), ' ', 10),6,10)))
               ELSE ''
           END) TEL
   FROM tb_alunos_detalhes ) B ON A.ADID = B.ID
SET A.ADTELALUNO = B.TEL;

Answer 2

use this for reference , and i think this will work for you
UPDATE(
  SELECT Ord.OrderID, Ord.Completed
  FROM Order1 Ord
  WHERE EXISTS(
          SELECT *
          FROM Product P
            INNER JOIN Delivery D
              ON Delivery.Delivered = 0 AND P.ProductID = Delivery.DeliveryID
          WHERE Ord.OrderID = P.OrderID
        )
)
SET Completed = 'NO' ;

//或没有派生表：

UPDATE Order1 Ord
SET Completed = 'NO' 
WHERE EXISTS(
        SELECT *
        FROM Product P
          INNER JOIN Delivery D
            ON Delivery.Delivered = 0 AND P.ProductID = Delivery.DeliveryID
        WHERE Ord.OrderID = P.OrderID
      );

Answer 3

正确的语法是：

UPDATE tb_alunos_detalhes A
    SET A.ADTELALUNO = (CASE WHEN `ADTELALUNO` <> ''
                             THEN ( CONCAT(SUBSTRING_INDEX(SUBSTRING_INDEX(`ADTELALUNO`, ' ', 1), ' ', -1), ' 9-', SUBSTRING(SUBSTRING_INDEX(SUBSTRING_INDEX(`ADTELALUNO`, ' ', 2), ' ', 10),6,10)))
                             ELSE ''
                        END);

不需要JOIN。

我的UPDATE查询与子查询有什么问题？

3 个答案: