Question : SQL Insert

When i run the following query, instead of inserting the values correctly. the values get added to the table.
 
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INSERT INTO
	tblMain
	(ExpectedVolume,Report,BatchCode,CSRep)
SELECT  

	ExpectedVolume.[Expected Volume],
	ExpectedVolume.Report,
	ExpectedVolume.BatchCode,
	ExpectedVolume.[CS Rep]

FROM         
	ExpectedVolume 
		INNER JOIN
			tblMain 
		ON ExpectedVolume.GCN = tblMain.GCN
WHERE 
	ExpectedVolume.GCN = tblMain.GCN

Answer : SQL Insert

try this
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update a
set a.ExpectedVolume = b.[Expected Volume]
from tblMain a 
inner join ExpectedVolume b on a.GCN = b.GCN
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