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How to do a SQL type operation???


Assume Table1={{a,Xa},{b,Xb},...,{n,Xn},...} where the key a can occur many
times and Xa is different each occurrence.

We also have table2={{a,Ya},{b,Yb},...,{n,Yn}}. Here a,b,...,n occur exactly
once. 

How do I create table3={{a,Xa,Ya},{b,Xb,Yb},...,{n,Xn,Yn},...} by joining
the tables on the first column?

From the problem, if a (or b or c or ...  n} is in table1, it is also in
table1 and visa versa.

The a,b,...,n,... Are small positive integers.

Thanks


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