Question

我想使用for循环将100到9999之间的数字添加到表中。我尝试了以下查询：

DELIMITER //
BEGIN
   FOR phone_number IN 100..9999 LOOP
     INSERT INTO phones (`phoneid`,`phone`,`active`) VALUES (NULL, phone_number, "1");
   END LOOP;
END
//

我收到以下错误

1064 - 您的SQL语法出错;查看与您的MySQL服务器版本对应的手册，以获得正确的语法，使用在'附近的电话号码IN 100..9999 LOOP INSERT INTO手机（第2行`ph'

有什么问题？

Answer 1

我不认为mysql存在＆＃34; for循环＆＃34;。你可以用这个：

DELIMITER //
DROP PROCEDURE IF EXISTS ins//
CREATE PROCEDURE ins()
BEGIN
DECLARE cnt INT;
   SET cnt=100;
WHILE cnt<10000 DO
  INSERT INTO phones (`phoneid`,`phone`,`active`) VALUES (NULL, cnt, "1");
  SET cnt=cnt+1;
END WHILE; 
END//
DELIMITER ;

CALL ins();

Answer 2

即使没有存储代码，您也可以生成所需的值，例如：

INSERT INTO phones (
  `phoneid`,
  `phone`,
  `active`
) 
SELECT 
  NULL, 
  n0.n+10*n1.n+100*n2.n+1000*n3.n AS num, 
  "1" 
FROM 
  (SELECT 0 AS n UNION ALL SELECT 1 UNION ALL SELECT 2 UNION ALL SELECT 3 UNION ALL SELECT 4 UNION ALL SELECT 5 UNION ALL SELECT 6 UNION ALL SELECT 7 UNION ALL SELECT 8 UNION ALL SELECT 9) AS n0 
  CROSS JOIN 
  (SELECT 0 AS n UNION ALL SELECT 1 UNION ALL SELECT 2 UNION ALL SELECT 3 UNION ALL SELECT 4 UNION ALL SELECT 5 UNION ALL SELECT 6 UNION ALL SELECT 7 UNION ALL SELECT 8 UNION ALL SELECT 9) AS n1
  CROSS JOIN 
  (SELECT 0 AS n UNION ALL SELECT 1 UNION ALL SELECT 2 UNION ALL SELECT 3 UNION ALL SELECT 4 UNION ALL SELECT 5 UNION ALL SELECT 6 UNION ALL SELECT 7 UNION ALL SELECT 8 UNION ALL SELECT 9) AS n2
  CROSS JOIN 
  (SELECT 0 AS n UNION ALL SELECT 1 UNION ALL SELECT 2 UNION ALL SELECT 3 UNION ALL SELECT 4 UNION ALL SELECT 5 UNION ALL SELECT 6 UNION ALL SELECT 7 UNION ALL SELECT 8 UNION ALL SELECT 9) AS n3
HAVING
  num>99

这些CROSS JOIN会生成值0..9999，因此您必须过滤那些低于100的值（这就是为什么它有HAVING子句）

如何仅在MySQL上使用SQL将数字添加到表中？

2 个答案: