SQL Server 2012 Management Studio (SSMS 2012): Database Engine Query - Retrieve data from 2 tables. MSG 205. All query combined using a UNION operator must have an equal number of expressions in their target lists?

Hi all,

I am rusty in doing T-SQL and I am new in doing Database Engine Query.

I have 2 dbo Table in SSMS 2012 and in the Database Engine Query, I executed the following T-SQL code in my SSMS 2012:

    SELECT Pt_ID, X, Y, Sample_id, Boring
    FROM  dbo.Table_1_APG_XYcoord
    WHERE sample_id<6
UNION
    SELECT Boring, sample_id, Unit, Arsenic,  Chromium, Lead
	FROM dbo.Table_2_APG_Soil
	WHERE sample_id>0
ORDER BY sample_id

I got the following:

MSG 205, Level 16, State 1, Line 1

All queries combined using a UINON, INTERSECT or EXCEPT operator must have an equal number of expressions in their target lists.

I have no ideas what the MSG means and how to correct the problem.  Please kindly help, advise and respond.

Thanks in advance,

Scott Chang