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Single Update Query - Required


Single Update Query - Required

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ManiDBLover
ManiDBLover
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Table 1:


Sno SID Sname
1 Null A
2 Null B
3 Null C
4 Null D
5 Null E




Table 2:


ano aID aName
1 55 AA
2 32 BB
3 53 CC
4 10 DD
5 10 EE




Requirement:
I need to update Table 1 - Column SID values with Table 2 - Column aID in a single update query

Output data should be:

 
Sno SID Sname
1 55 A
2 32 B
3 53 C
4 10 D
5 10 E


Kingston Dhasian
Kingston Dhasian
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This seems quite simple like homework stuff
Can you let us know what you have tried?
If you are stuck somewhere, we are happy to help you.


Kingston Dhasian

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Alan.B
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This should get you started...


IF OBJECT_ID('tempdb..#table1') IS NOT NULL
DROP TABLE #table1;

IF OBJECT_ID('tempdb..#table2') IS NOT NULL
DROP TABLE #table2;

CREATE TABLE #table1 (sno int unique NOT NULL, [sid] int NULL, sname varchar(2) unique NOT NULL);
CREATE TABLE #table2 (ano int unique NOT NULL, [aid] int NULL, aname varchar(2) unique NOT NULL);

INSERT INTO #table1
SELECT 1,Null,'A' UNION ALL
SELECT 2,Null,'B' UNION ALL
SELECT 3,Null,'C' UNION ALL
SELECT 4,Null,'D' UNION ALL
SELECT 5,Null,'E';

INSERT INTO #table2
SELECT 1,55,'AA' UNION ALL
SELECT 2,32,'BB' UNION ALL
SELECT 3,53,'CC' UNION ALL
SELECT 4,10,'DD' UNION ALL
SELECT 5,10,'EE';

-- Here's what we need #table 1 to look like:
SELECT t1.sno,
t2.aid,
t1.sname
FROM #table1 t1
JOIN #table2 t2 ON t1.sno=t2.ano;

-- This will do it (Update based on a join)
UPDATE t1
SET t1.[sid]=t2.aid
FROM #table1 t1
JOIN #table2 t2 ON t1.sno=t2.ano;

-- did it work?
SELECT * FROM #table1;

--cleanup
DROP TABLE #table1;
DROP TABLE #table2;
GO



-- Alan Burstein



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robertd 77391
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A simple way to do this:



update #Table1
set #Table1.SID = #Table2.aID
from #Table2
where #Table1.Sno = #Table2.Sno ;



Sean Lange
Sean Lange
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robertd 77391 (3/12/2013)
A simple way to do this:



update #Table1
set #Table1.SID = #Table2.aID
from #Table2
where #Table1.Sno = #Table2.Sno ;




I can't for the life me remember the details but there is an issue when you do an UPDATE FROM and the table being updated is not in the query. It is better to use the join method as demonstrated by Alan above.

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Lynn Pettis
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Sean Lange (3/12/2013)
robertd 77391 (3/12/2013)
A simple way to do this:



update #Table1
set #Table1.SID = #Table2.aID
from #Table2
where #Table1.Sno = #Table2.Sno ;




I can't for the life me remember the details but there is an issue when you do an UPDATE FROM and the table being updated is not in the query. It is better to use the join method as demonstrated by Alan above.


I think what is needed for this would be this:



update #Table1
set SID = (SELECT #Table2.aID from #Table2 where #Table1.Sno = #Table2.Sno) ;




Cool
Lynn Pettis

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ManiDBLover
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Hi All,

Thanks for your help.

All your solutions worked!


Regards,
Mani
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