I've a table with two columns C1 and C2 and having following data in it.
C1 C2
--------------
A1
A3
A4
A7
B1
B2
B3
C1
C2
C3
C5
I want to write query which should return all the missing sequence per group like below:
A 2
A 5
A 6
C 4
Thanks in Advance.