Home/ Questions/Q 6750539
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-05-26T12:49:10+00:00

In SQL Server, ISNULL() function has to same type of parameters. check_expression Is the

  • 0

In SQL Server, ISNULL() function has to same type of parameters.

check_expression

Is the expression to be checked for NULL. check_expression can be of
any type.

replacement_value

Is the expression to be returned if check_expression is NULL.
replacement_value must have the same type as check_expresssion.

How can I use it with different type of parameter? I want to use with date and string parameter like this ISNULL(A.DATE, '-')

NOTE: Type of A.DATE is datetime.

EDIT-1: My full query which is getting 0 row:

    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: But this working

select ISNULL( CONVERT(VARCHAR(25), A.RESOLUTIONDATE, 112) , '-' )
FROM Jira.jiraissue A

Could be the reason JOIN ?

Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    You can’t. The ISNULL function is used by itself as a query result column, or in an expression that eventually is a column in the query result. All fields/rows in a column must have the same data type. So you’ll have to choose.

    One solution would be to cast the DATE to string, so the result is always a string, but i feel the best solution would be to return NULL for empty dates and let the presentation layer decide whether or not the NULL dates should be shown as - and in what format the non-null dates should be displayed (client locale settings).

    With presentation layer, I mean anything that displays or outputs this data, which can be a web page, a CSV exporter, a reporting tool, whatever.

    • 0