October 29, 2012 at 1:33 pm
I need to pull the data from two tables called Table1 & Table2.
Table1 has following columns:
ServerName ApplicationName ApplicationID
Table2 has following columns:
ServerName ApplicationName ApplicationID
From these I need Servername, ApplicationID and one extra coulmn called 'Appserver'. Which is not present in both the tables.
This column should be appeared as
Table1 if 'Servername', 'ApplicationID' pulled only from Tabe1
or
Table2 if 'Servername', 'ApplicationID' pulled only from Table2
or
Combine if 'Servername', 'ApplicationID' pulled from only both tables (table1& Table2)
Thanks
October 29, 2012 at 1:49 pm
sounds like a case statement or a union all, but i'm having trouble figuring out where your data is
soemthing like this?
SELECT Servername, ApplicationID, 'Table1' AS Appserver FROM Table1 UNION ALL
SELECT Servername, ApplicationID, 'Table2' AS Appserver FROM Table2 UNION ALL
SELECT Servername, ApplicationID, 'Combine' AS Appserver FROM Combine
--or is it like this?
SELECT Servername, ApplicationID, CASE
WHEN Table1.SomeValue IS NULL
Then 'Table2'
WHEN Table2.SomeValue IS NULL
Then 'Table1'
ELSE 'Combine'
END AS Appserver
FROM CentralTable
Lowell
October 29, 2012 at 1:51 pm
Select T1.ServerName, T1.ApplicationName, T1.ApplicationID, AppServer = 'Combined'
from Table1 T1
inner join Table2 T2 ON T1.ServerName = T2.ServerName
and T1.ApplicationID = T2.ApplicationID
UNION All
Select T1.ServerName, T1.ApplicationName, T1.ApplicationID, AppServer = 'Table1'
from Table1 T1
Left join Table2 T2 ON T1.ServerName = T2.ServerName
and T1.ApplicationID = T2.ApplicationID
UNION ALL
Select T1.ServerName, T1.ApplicationName, T1.ApplicationID, AppServer = 'Table2'
from Table1 T1
Right join Table2 T2 ON T1.ServerName = T2.ServerName
and T1.ApplicationID = T2.ApplicationID
October 29, 2012 at 1:56 pm
Maybe:
Select IsNull(t1.ServerName,t2.ServerName) as ServerName,
IsNull(t1.ApplicationName,t2.ApplicationName) as ApplicationName,
Case
When t1.ApplicationName is null then 'Table2'
When t2.ApplicationName is null then 'Table1'
Else 'Combine'
End AppServer
From Table1 t1
Full Outer Join Table2 t2 on
(t1.ServerName = t2.ServerName) and (t1.ApplicationName = t2.ApplicationName)
October 29, 2012 at 2:09 pm
SSCRookie,
Your logic is perfect. It is a good strategy to save some coding by using Full Outer Join and CASE istead of lousy Left/Right/Inner join and Union. Thanks for sharing good work.
Regards,
T_Dot_Geek
October 29, 2012 at 5:58 pm
Thank you ver much...I am looking to modify the query as below
select distinct t1.ServerName, t1.[Application ID], t1.[Application Name], t2.VP1, T2.VP2, T2.SVP, T2.[DC2015 Move Group], T1.[System Type],
T3.Line, AppServerSource = (Select IsNull(t1.ServerName,t2.ServerName) as ServerName,
IsNull(t1.[Application Name],t2.[Application Name]) as [Application Name],
Case
When t1.[Application Name] is null then 'Check'
When t2.[Application Name] is null then 'Payorder'
Else 'Both'
End AppServer)
from Table1 t1 INNER JOIN Table2 t2
on t1.[Application ID]= t2.[Application ID] and t1.Servername = t2.ServerName JOIN BIM T3
ON t1.[Application Name]= t3.[Application Name]
order by Servername
After executing the above query I am getting the follwoing error.
Msg 116, Level 16, State 1, Line 1
Only one expression can be specified in the select list when the subquery is not introduced with EXISTS.
October 29, 2012 at 8:12 pm
Please Look at below statement where There is anInvalid use of bracket and Select statement.
Your code is little bit confusing.
AppServerSource = (Select IsNull(t1.ServerName,t2.ServerName) as ServerName
I tried to fix as below. Please try this one :
select distinct
t1.ServerName,
t1.[Application ID],
t1.[Application Name],
t2.VP1,
T2.VP2,
T2.SVP,
T2.[DC2015 Move Group],
T1.[System Type],
T3.Line,
IsNull(t1.ServerName,t2.ServerName) as ServerName,
IsNull(t1.[Application Name],t2.[Application Name]) as [Application Name],
Case
When t1.[Application Name] is null then 'Check'
When t2.[Application Name] is null then 'Payorder'
Else 'Both'
End AppServer
from Table1 t1 INNER JOIN Table2 t2
on t1.[Application ID]= t2.[Application ID] and t1.Servername = t2.ServerName JOIN BIM T3
ON t1.[Application Name]= t3.[Application Name]
order by Servername
October 30, 2012 at 3:54 am
-- formatted original
select distinct
t1.ServerName,
t1.[Application ID],
t1.[Application Name],
t2.VP1,
T2.VP2,
T2.SVP,
T2.[DC2015 Move Group],
T1.[System Type],
T3.Line,
-- defines 1 column
AppServerSource = (
Select -- returns 3 columns
IsNull(t1.ServerName,t2.ServerName) as ServerName,
IsNull(t1.[Application Name],t2.[Application Name]) as [Application Name],
Case
When t1.[Application Name] is null then 'Check'
When t2.[Application Name] is null then 'Payorder'
Else 'Both'
End AppServer)
from Table1 t1
INNER JOIN Table2 t2
on t1.[Application ID]= t2.[Application ID]
and t1.Servername = t2.ServerName
JOIN BIM T3
ON t1.[Application Name]= t3.[Application Name]
order by Servername -- this is ambiguous and will error - use a table alias
-- alternative
select distinct
t1.ServerName,
t1.[Application ID],
t1.[Application Name],
t2.VP1,
T2.VP2,
T2.SVP,
T2.[DC2015 Move Group],
T1.[System Type],
T3.Line,
ServerName = IsNull(t1.ServerName,t2.ServerName),
[Application Name] = IsNull(t1.[Application Name],t2.[Application Name]),
AppServer = Case
When t1.[Application Name] is null then 'Check'
When t2.[Application Name] is null then 'Payorder'
Else 'Both'
End
from Table1 t1
INNER JOIN Table2 t2
on t1.[Application ID]= t2.[Application ID]
and t1.Servername = t2.ServerName
INNER JOIN BIM T3
ON t1.[Application Name]= t3.[Application Name]
order by t1.Servername
For fast, accurate and documented assistance in answering your questions, please read this article.
Understanding and using APPLY, (I) and (II) Paul White
Hidden RBAR: Triangular Joins / The "Numbers" or "Tally" Table: What it is and how it replaces a loop Jeff Moden
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