Update table a columns using columns from table b (values of 2 columns of table b need to taken from table c)

Question

Guys,
I need to update table A columns col3, col4, col5 and col6 by table b columns col3, col4, col5 and col6 however table b col5 and col6 values need to come from table c col1.
Means table b col5 and col6 have values in it however i need to replace them with value from table c col1 and need to update table a col5 and col6 accordingly.
table a and table b has col1 and col2 in common.
i am trying something like this.
Update a
a.col3 = b.col3,
a.col4 = b.col4,
a.col5 = (select col1 from table_c c where c.col2=b.col5),
a.col6 = (select col1 from table_c c where c.col2=b.col6)
from table_A a inner join table_b
on  a.col1=b.col1 and a.col2=b.col2
can someone help me reframe above update query?
thanks in advance for your help.

Answer 1

Try the below:(If you have multiple values, then you may need to use TOP 1 as commented code in the below script)
create Table tableA(Col1 int,Col2 int,Col3 int,Col4 int,Col5 int,Col6 int)
Insert into tableA values(1,2,3,4,5,6)
create Table tableB(Col1 int,Col2 int,Col3 int,Col4 int,Col5 int,Col6 int)
Insert into tableB values(1,2,30,40,50,60)
create Table tableC(Col1 int,Col2 int,Col3 int,Col4 int,Col5 int,Col6 int)
Insert into tableC values(100,50,30,40,2,2)
--Insert into tableC values(200,50,30,40,2,2)
Insert into tableC values(100,60,30,40,2,2)
Select * From tablea
Update a Set
a.col3 = b.col3,
a.col4 = b.col4,
a.col5 = (select col1 from tablec c where c.col2=b.col5 ),
a.col6 = (select col1 from tablec c where c.col2=b.col6 )
from tableA a inner join tableb b
on a.col1=b.col1 and a.col2=b.col2
--Update a Set
--a.col3 = b.col3,
--a.col4 = b.col4,
--a.col5 = (select Top 1 col1 from tablec c where c.col2=b.col5 Order by c.Col1 asc),
--a.col6 = (select Top 1 col1 from tablec c where c.col2=b.col6 Order by c.Col1 asc)
--from tableA a inner join tableb b
--on a.col1=b.col1 and a.col2=b.col2
Select * From tablea
Drop table tablea,Tableb,TableC