Question

我从未使用过sybase，直到今天。我在Access中有一个使用First（）的查询，并且有多个iif语句。我希望最好并粘贴我的查询，我在First（）部分遇到错误。我从查询中删除了First，并且我在iif语句中遇到错误。

这是我的问题：

SELECT Client.ClientId, First(Trans.SysId) AS FirstOfSysId, Client.Name1,
Relation.Name1, Debtor.Name1, Account.AcctId, First(Trans.PostDate) AS FirstOfPostDate,
Sum(IIf([TransType]="uc",[Amount],IIf([TransType]="CA",[Amount],IIf([TransType]="RAC",
[Amount],IIf([TransType]="UCBR",[Amount],[amount]*-1))))) AS TransAmount, 
Trans.CheckId,Relation.RelId
FROM (((Trans INNER JOIN Account ON Trans.SysAcctId = Account.SysId) 
INNER JOIN Debtor ON Account.SysDtrId = Debtor.SysId) 
INNER JOIN Relation ON Account.SysRelId = Relation.SysId) INNER JOIN Client ON
Relation.SysClientId = Client.SysId
WHERE (((Trans.TransType)="CA" Or (Trans.TransType)="NC" Or (Trans.TransType)="UC" Or
(Trans.TransType)="AC" 
Or (Trans.TransType)="UCB" Or (Trans.TransType)="RAC" Or (Trans.TransType)="UCB" Or
(Trans.TransType)="UCBR"))
GROUP BY Client.ClientId, Client.Name1, Relation.Name1, Debtor.Name1, Account.AcctId, 
Trans.CheckId, Relation.RelId
HAVING (((Client.ClientId)=[Forms]![frmCredit]![Combo112])
AND ((Sum(IIf([TransType]="uc",[Amount],IIf([TransType]="CA",[Amount],
IIf([TransType]="RAC", [Amount],IIf([TransType]="UCBR",[Amount],[amount]*-1))))))>0 
Or (Sum(IIf([TransType]="uc",[Amount],IIf([TransType]="CA",[Amount],
IIf([TransType]="RAC", [Amount],IIf([TransType]="UCBR",[Amount],[amount]*-1))))))<0)
AND ((Relation.RelId) Not Like "281099"))
ORDER BY Relation.Name1, Account.AcctId, Trans.CheckId

[编辑] http://sqlfiddle.com/#!2/4b98e0/1 [/编辑]

添加了更具可读性的查询

我无法找到转换第一个函数的文档，但是我应该将它转换为Case when语句吗？我看了一篇文章here，但我不确定它是否最有效，因为它是从1999年开始......

我得到的错误是Syntax error near 'FIRST' on line 1.根据文章here我正在使用正确的语法。

在正确的语法中使用First的任何帮助，如果我应该使用Case而不是iif，我们非常感谢。

Answer 1

基于我认为查询的内容，我认为您可以重写它，如下所示。我无权访问任何Sybase服务器来验证查询，因此我在MS SQL上尝试了它，但我注释了一些可能不需要Sybase的/ * * /。

这可能是完全错误的，或者可能是正确的。如果错了，请在评论中告诉我，我会删除我的答案。

SELECT 
    Client.ClientId, 
    FIRST_VALUE(Trans.SysId) /* OVER (ORDER BY Trans.Sysid) */ AS FirstOfSysId, 
    Client.Name1,
    Relation.Name1, 
    Debtor.Name1, 
    Account.AcctId, 
    FIRST_VALUE(Trans.PostDate) /* OVER (ORDER BY Trans.postdate) */ AS FirstOfPostDate,
    SUM(CASE 
          WHEN [TransType] IN ('uc', 'CA', 'RAC', 'UCBR') THEN AMOUNT 
          ELSE AMOUNT * -1 
       END
       ) AS TransAmount, 
    Trans.CheckId,
    Relation.RelId
FROM Trans 
INNER JOIN Account ON Trans.SysAcctId = Account.SysId
INNER JOIN Debtor ON Account.SysDtrId = Debtor.SysId 
INNER JOIN Relation ON Account.SysRelId = Relation.SysId
INNER JOIN Client ON Relation.SysClientId = Client.SysId

WHERE Trans.TransType IN ('CA','NC','UC','AC','UCB','RAC','UCB','UCBR')

GROUP BY 
    Client.ClientId, Client.Name1, 
    Relation.Name1, Debtor.Name1, 
    Account.AcctId, Trans.CheckId, 
    Relation.RelId /* , trans.sysid, trans.postdate */

HAVING 
    1=1 --AND (((Client.ClientId)=[Forms]![frmCredit]![Combo112])
    AND SUM(
          CASE WHEN [TransType] IN ('uc', 'CA', 'RAC', 'UCBR') THEN AMOUNT 
          ELSE AMOUNT * -1 END
          ) <> 0 
    AND Relation.RelId <> '281099'

ORDER BY Relation.Name1, Account.AcctId, Trans.CheckId

我的理由是

Sum(IIf([TransType]="uc",[Amount],IIf([TransType]="CA",[Amount],IIf([TransType]="RAC",
[Amount],IIf([TransType]="UCBR",[Amount],[amount]*-1))))) AS TransAmount,

如果amount是TransType其他'uc', 'CA', 'RAC', 'UCBR'中的任何一个，则只需Amount*-1，这应与以下内容相同：

SUM(CASE WHEN [TransType] IN ('uc', 'CA', 'RAC', 'UCBR') THEN AMOUNT 
        ELSE AMOUNT*-1 END) AS TransAmount,

并在having条款中：

((Sum(IIf([TransType]="uc",[Amount],IIf([TransType]="CA",[Amount],
IIf([TransType]="RAC", [Amount],IIf([TransType]="UCBR",[Amount],[amount]*-1))))))>0 
Or (Sum(IIf([TransType]="uc",[Amount],IIf([TransType]="CA",[Amount],
IIf([TransType]="RAC", [Amount],IIf([TransType]="UCBR",[Amount],[amount]*-1))))))<0)

只检查表达式（sum(amount)）是> 0还是< 0，这应该等同于：

SUM(CASE WHEN [TransType] IN ('uc', 'CA', 'RAC', 'UCBR') THEN AMOUNT 
        ELSE AMOUNT*-1 END) <> 0

sybase查询中的语法错误

1 个答案: