Query to solve

Question

I have employee table and salary table.
Employee table
Empno ename
101 a
102 b
103 c
Salary table
empno salary ename
101 50000
102 60000
103 40000
Now i want to update ename in salary table.Ename should be ename of employee table for the corresponding
Empno in salary table.
for ex after update in salary table
salary table should be like this
empno salary ename
101 50000 a
102 60000 b
103 40000 c
Pls give querys to solve.

Answer 1

If it is homework its a terrible example as its denormalising the data. That should probably should be your answer. However, if you really want to do this, try:
UPDATE salary a
SET    a.ename = (SELECT b.ename
                  FROM   employee b
                  WHERE  b.empno = a.empno)
WHERE EXISTS (SELECT 1
              FROM   employee c
              WHERE  c.empno = a.empno)