Query Help Merging 2 Tables

create table table1 (colA int, colB int, colC int, colD varchar(50))
Insert into table1 values(1, 4, 7, 'a') , (2, 5, 8, 'b'), (3, 6, 9, 'c') 
create table table2(colA int, colB int, colC int, colE varchar(50))
Insert into table2 values(1, 4, 7, 'd') , (4, 5, 8, 'e')
Select COALESCE(a.ColA,b.Cola) Cola, 
COALESCE(a.Colb,b.Colb) Colb,
COALESCE(a.Colc,b.Colc) Colc,
 a.ColD,   
 b.ColE  ColE 
 from table1 a full OUTER JOIN  table2 b ON  a.colA=b.cola
drop table table1
drop table table2
/*
Cola    Colb    Colc    ColD    ColE
1       4       7       a       d
2       5       8       b       NULL
3       6       9       c       NULL
4       5       8       NULL    e
*/