在 SQL Server 中,ISNULL()函数必须具有相同类型的参数。
check_expression
是要检查 NULL 的表达式。check_expression 可以是任何类型。
替换值
如果 check_expression 为 NULL,则返回表达式。replacement_value必须与 check_expresssion 具有相同的类型。
如何将它与不同类型的参数一起使用?我想使用 withdate
和string
这样的参数ISNULL(A.DATE, '-')
注意:类型A.DATE
是datetime
。
EDIT-1:我的完整查询得到 0 行:
SELECT A.pkey as KREDİ, A.SUMMARY , D.BayiStatu AS STATU, D.Sorumlu AS SORUMLU, C.BayiSonuc as SONUC, ISNULL( CONVERT(VARCHAR(25), A.CREATED, 112) , '-' ), ISNULL( CONVERT(VARCHAR(25), A.RESOLUTIONDATE, 112) , '-' ), dbo.CUSTVAL(11931, A.ID, 'S') AS BAYİ, ISNULL( CONVERT(VARCHAR(25), dbo.GetLastStatuTime(A.ID), 112) , '-' ) AS SON_STATU_TAR,j2.SUMMARY, ISNULL( CONVERT(VARCHAR(25), j2.CREATED, 112) , '-' ), ISNULL( CONVERT(VARCHAR(25), j2.RESOLUTIONDATE, 112) , '-' ), j3.SUMMARY, ISNULL( CONVERT(VARCHAR(25), j3.CREATED, 112) , '-' ), ISNULL( CONVERT(VARCHAR(25), j3.RESOLUTIONDATE, 112) , '-' )
FROM AspNetServicesDB.dbo.SONUC_MAP C, JİRA.resolution E, jira.issuestatus B, AspNetServicesDB.dbo.STATU_MAP D, Jira.jiraissue A
INNER JOIN Jira.issuelink i
ON i.SOURCE = A.ID and i.SEQUENCE = 0
INNER JOIN Jira.jiraissue As j2
ON i.DESTINATION =j2.ID
LEFT JOIN Jira.issuelink i2
ON i2.SOURCE = A.ID and i2.SEQUENCE = 1
LEFT JOIN Jira.jiraissue As j3
ON i2.DESTINATION = j3.ID
WHERE A.issuestatus = B.ID
AND 'BAŞARAN OTOMATİV' = dbo.CUSTVAL(11931, A.ID, 'S')
AND B.pname = D.JiraStatu collate Turkish_CS_AI
AND A.issuetype != 11
AND A.RESOLUTION = E.ID
AND E.pname = C.JiraSonuc collate Turkish_CS_AI
EDIT-2:但这工作
select ISNULL( CONVERT(VARCHAR(25), A.RESOLUTIONDATE, 112) , '-' )
FROM Jira.jiraissue A
可能是原因JOIN
吗?