Join two columns from two different tables - sql-server

Question

I have a problem in joining the two columns from two different tables.
The Scenario is: I have a table A with 11 columns and another table B with 6 columns.
There is a column names SAMPLE1 which exists in both the tables.But, SAMPLE2 from 1st table A and ABC from 2nd table B are having the same value but with different column names. Same with SAMPLE3 and DEF. Now I would like to join that columns to a single column (which consists of data from both the tables) and rest of the columns also should appear on that final table.
Example:
Table A
SAMPLE1 SAMPLE2 SAMPLE3 .........SAMPLE 11 (Total 11 columns in this table)
US 75.2 US1_US NULL
INDIA 71 I3_INDIA NULL
UK 1851.23 UK1_UK NULL
Table B
SAMPLE1 ABC DEF............. XYZ (Total 6 columns in this table)
CHINA 123.2 C1_CHINA 2
JAPAN 1.1 J1_JAPAN 2
GERMANY 10.2314 G1_GERMANY 2
SINGAPORE 100.22 S1_SINGAPORE 2
Now I would like to see the output like this:
SomeTable
SAMPLE1 SOMENAME1 SOMENAME2..SAPMLE 11 ABC DEF ..... SOMENAME3
US 75.2 US1_US NULL NULL NULL NULL
INDIA 71 I3_INDIA NULL NULL NULL NULL
UK 1851.23 UK1_UK NULL NULL NULL NULL
CHINA 123.2 C1_CHINA NULL NULL NULL 2
JAPAN 1.1 J1_JAPAN NULL NULL NULL 2
GERMANY 10.2314 G1_GERMANY NULL NULL NULL 2
SINGAPORE 100.22 S1_SINGAPORE NULL NULL NULL 2
In short:
SELECT
(SAMPLE1(FROM TABLE A) + SAMPLE1(FROM TABLE B)) AS SAMPLE1,
(SAMPLE2 + ABC) AS SOMENAME1,
(SAMPLE3 + DEF) AS SOMENAME2,
A.SAMPLE4, A.SAMPLE5,...,
B.GHI, B.JKL,...
(A.SAMPLE11 +B.XYZ) AS SOMENAME3
I have used union but it didn't work.
select SAMPLE1,SAMPLE2,SAMPLE3,...,SAMPLE 11 from TABLE A
UNION
SELECT SAMPLE1, ABC, DEF, ...., XYZ FROM TABLE B
Now I am getting an error:
Msg 205, Level 16, State 1, Line 1
All queries combined using a UNION,
INTERSECT or EXCEPT operator must have
an equal number of expressions in
their target lists.
I have used union, coalesce, full outer join (all the suggestions or answers below)
The final code will be used in a select statement. How?

Answer 1

You're probably looking for a join, like:
select a.sample1
, a.sample2
, b.abc
, b.def
... etc ...
from TableA as a
full outer join
TableB as b
where a.sample1 = b.sample1

Answer 2

Join the two tables using FULL OUTER (preserve data from either table where it does not exist on the other), then use COALESCE to get the common SAMPLE1 column from whichever table has it.
SELECT COALESCE(A.SAMPLE1, B.SAMPLE1) SAMPLE1,
A.SAMPLE2,
A.SAMPLE3,
...
A.SAMPLE11,
B.ABC,
B.DEF,
...
B.XYZ
FROM table1 A FULL OUTER JOIN table2 B on A.SAMPLE1 = B.SAMPLE1
References: MSDN - Using Outer Joins / COALESCE

Answer 3

TRY THIS, IT MAY BE USEFUL
table 1 contains 5 columns
select col1,col2...col5 from table1
table 2 contains 3 columns
select col1,col2,col3 from table1
Query:
select col1,col2,col3,col4,col5 from table1
union
select col1,col2,col3,'','' from table1