find discrepancy between two tables

Hi Experts,
I have to find the discrepancy between two tables
I have Table 1 with columns
OrderID
Date
Quantity
Symbol
Table 2 with columns
OrderID
Date
Quantity
Symbol
I want a script to find out a list of OrderIDs present in table1 but not in table 2 and a list of OrderIDs present in table2 but not in table 1.

Could any one help me in writing this query
thanks in advance