1 Find all the possible super keys from the given relation.

2 Find all candidate keys from the given relation.

3 Select a Primary Key for this table.

\begin{tabular}{|r|r|r|r|r|} \hline \multicolumn{1}{|c|}{ order } & \multicolumn{1}{l|}{ buyer } & product & \multicolumn{1}{l|}{ amount } & \multicolumn{1}{l|}{ date } \\ \hline 1 & 10 & 21 & 2 & 1/1/1989 \\ \hline 2 & 10 & 22 & 5 & 2/1/1989 \\ \hline 3 & 12 & 23 & 1 & 3/1/1989 \\ \hline 4 & 13 & 24 & 3 & 4/1/1989 \\ \hline 5 & 14 & 25 & 4 & 5/1/1989 \\ \hline 6 & 15 & 26 & 5 & 6/1/1989 \\ \hline 7 & 16 & 27 & 1 & 7/1/1989 \\ \hline 8 & 17 & 28 & 5 & 8/1/1989 \\ \hline 9 & 18 & 29 & 4 & 9/1/1989 \\ \hline 10 & 19 & 30 & 3 & 10/1/1989 \\ \hline \end{tabular}