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Vaibhav GoelFlag for India

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I have 2 tables a and b. I want to remove duplicates from table b which have a entry in a .

Sample data :

table a1         table a2
a                       b
1                      1
2                       1
                          2
                           3
                           3

Output:
Table b:

1
2
3
3
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Pawan Kumar
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thanks