继触发器之后,引发的问题! Subquery returns more than 1 rows

本文链接： https://blog.csdn.net/choath/article/details/88850476

之前写了一篇博客,写的如何去写触发器,下面是链接地址:

https://blog.csdn.net/choath/article/details/86512491

下面就是当时写的触发器:

报错信息:Subquery returns more than 1 rows

BEGIN
declare phoneno varchar(20) character set utf8;
declare agencynameq varchar(100) character set utf8;
declare agencynameaa varchar(500) character set utf8;
declare phonenumber4 varchar(20) character set utf8;
declare phonenumber6 varchar(20) character set utf8;
IF new.state in ('2','3') then

set agencynameq = (SELECT AgencyName FROM ehome_green_agency_location WHERE TransNo =new.tranno);
SELECT phonenumber into phonenumber6 FROM sys_user WHERE id = (SELECT userid FROM sys_user_branch WHERE branch_code =
(SELECT substring((SELECT AgencyCode FROM ehome_green_agency_location WHERE TransNo = new.tranno),1,6)));

SELECT phonenumber into phonenumber4 FROM sys_user WHERE id = (SELECT userid FROM sys_user_branch WHERE branch_code =
(SELECT substring((SELECT AgencyCode FROM ehome_green_agency_location WHERE TransNo = new.tranno),1,4)));

SELECT idno into agencynameaa FROM ehome_green_agency_location WHERE TransNo = new.tranno;

if agencynameq is NULL then
set agencynameq = 'sa';
iNSERT INTO `userservice`.`ehome_us_green_message` (
   receivingPlatform,businesstype,serviceid,transno,wxstate,templateid,contents,description,updateflag,senddate,
   sendtype,sendtimes,createduser,createddate)
VALUES
   ('9','00','ceptrans0002',new.tranno,'0','AuditDX',CONCAT('Name:',agencynameq),'未查到审核人员手机号','4',sysdate(),
       '1','0','sys',sysdate());
END if;
if phonenumber6 is NOT NULL then
INSERT INTO `userservice`.`ehome_us_green_message` (
   receivingPlatform,businesstype,serviceid,transno,wxstate,templateid,contents,description,updateflag,senddate,
   sendtype,sendtimes,createduser,createddate)
VALUES
   ('3',phonenumber6,'ceptrans0002',new.tranno,'0','AuditDX',CONCAT('Name:',agencynameq) ,'待推送','0',sysdate(),
       '1','0','sys',sysdate());
elseif phonenumber4 is NOT NULL then
INSERT INTO `userservice`.`ehome_us_green_message` (
   receivingPlatform,businesstype,serviceid,transno,wxstate,templateid,contents,description,updateflag,senddate,
   sendtype,sendtimes,createduser,createddate)
VALUES
   ('3',phonenumber4,'ceptrans0002',new.tranno,'0','AuditDX',CONCAT('Name:',agencynameq) ,'待推送','0',sysdate(),
       '1','0','sys',sysdate());
END if;
END IF;
END

上面这个触发器有1个问题?

该触发器的子查询很多,而且子查询的赋值是"=",存在自查询的情况下,用"="赋值,

扫描二维码关注公众号，回复： 7592422 查看本文章

可能出现子查询查出的结果不是一条,这样会出现一个"子查询的结果大于1的报错!"

这是你在修改相关表数据的时候报的,导致你无法修改表数据!!!

优化:取查询结果中的一条即可

继触发器之后,引发的问题! Subquery returns more than 1 rows

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