Question

感谢您查看此问题。我正在使用MSSQL Server Express。我正在尝试编写一个触发器，它将根据客户的年龄和收入更新客户的资格。我写了很久以来的部分，但我完全陷入了资格部分。我有声明可以根据收入，周期（月/年），家庭规模选择不符合资格的客户

Select ClientID,c.HshldSize,c.MonthlyYearly,c.AnnualHshldIncome,i.SeniorMo,
       StatusID,i.HshldSize
from Clients c 
join IncomeEligibility i on c.HshldSize = i.HshldSize
where c.HshldSize= i.HshldSize and c.AnnualHshldIncome >= i.SeniorMo 
      and StatusID in (1,2) 
      and c.CategCode = 'SR' and MonthlyYearly ='month'

此选择显示所有不符合条件的客户回复示例

   ClientID HshldSize   MonthlyYearly   AnnualHshldIncome  SeniorMo StatusID HshldSize
    28       1             month         1095                977    2         1
    51       1             month         1253                977    1         1
    63       1             month         1300                977    1         1
    73       1             month         1200                977    1         1
    96       1             month         1300                977    1         1
    101      1             month         1255                977    1         1
    160      2             month         1800                1513   1         2

IncomeEligibility看起来像这样

HshldSize   AKGuidline  WomanChildYr    WomanChildMo    SeniorYr    SeniorMo    PFDYr   PFDMo
1   9020    16687   1391    11726   977 878 73
2   13970   25845   2154    18161   1513    1756    146
3   18920   35002   2917    24596   2050    2634    219
4   23870   44160   3680    31031   2586    3512    292
5   28820   53317   4443    37466   3122    4390    365
6   33770   62475   5206    43901   3658    5268    439
7   38720   71632   5969    50336   4195    6146    512
8   43670   80790   6733    56771   4731    7024    585
9   48620   89947   7496    63206   5267    7902    658
10  53570   99105   8259    69641   5803    8780    731
11  58520   108262  9022    76076   6340    9658    804
12  63470   117420  9785    82511   6876    10536   878
13  68420   126577  10548   88946   7412    11414   951
14  73370   135735  11311   95381   7948    12292   1024
15  78320   144892  12074   101816  8485    13170   1097
16  83270   154050  12838   108251  9021    14048   1170
17  88220   163207  13601   114686  9557    14926   1243
18  93170   172365  14364   121121  10093   15804   1317
19  98120   181522  15127   127556  10630   16682   1390
20  103070  190680  15890   133991  11166   17560   1463

如果clientrow不符合条件，触发器应设置StatusID = 5。到目前为止，我有这个触发器

create trigger tr_EligebilityCheck
on dbo.Clients
FOR INSERT,UPDATE
as 
/*Check if Senior  not eligible by age*/
If (select CategCode from inserted )='SR'
declare 
@DOB date
SET @DOB = (select dob from inserted)
if DATEDIFF(YEAR,@DOB,GETDATE())<60

BEGIN
Update Clients
set StatusID = 5
From Clients c, inserted i
where c.CategCode = 'SR' and i.ClientID = C.ClientID
END

/*Check if Children eligebel by age*/
If (select CategCode from inserted )='CH'
declare 
@DOBCH date
SET @DOBCH = (select dob from inserted)
if DATEDIFF(YEAR,@DOBCH,GETDATE()) >=6

BEGIN
Update Clients
set StatusID = 5
From Clients c, inserted i
where c.CategCode ='CH' and i.ClientID = C.ClientID
END

但不知道如何按收入添加检查，如果您知道如何执行此操作，请提供帮助。当我在插入新的reccourd

时，看起来我的触发器不起作用

Msg 512, Level 16, State 1, Procedure tr_EligebilityCheck, Line 6
Subquery returned more than 1 value. This is not permitted when the subquery follows =, !=, <, <= , >, >= or when the subquery is used as an expression.

谢谢！

Answer 1

如果这是确定谁不符合条件的唯一方法，那么您已准备好选择声明。所以你只需要更新符合该标准的那些。用子查询做（我做不 SQLFiddle）。您可以将更新放在触发器所需的任何位置。

UPDATE Clients 
SET 
theColName = 'value' 
WHERE 
ClientID IN (Select ClientID
             from Clients c 
             join IncomeEligibility i 
                  on c.HshldSize = i.HshldSize
             where c.HshldSize= i.HshldSize 
                   and c.AnnualHshldIncome >= i.SeniorMo 
                   and StatusID in (1,2) 
                   and c.CategCode = 'SR' 
                   and MonthlyYearly ='month')

错误是关于此行If (select CategCode from inserted )='SR'选择CategCode查询返回多个值，因此等号是错误的运算符。虽然我会把'SR'放在一个变量中，但尝试这种方法。

if @var IN (select CategCode from inserted)

该语句在结果集中查找值IN，而不是查看它是否等于多个值。查看您的查询结果，看看它是否返回多个CategCodes，这就是错误所说的内容。

在插入和更新时卡住Trigger

1 个答案: