main4union1

\BEGIN{TABLE}
    \caption {main4union1}
    \BEGIN{tabular}{|l|}
    \hline
    Main query BEFORE                                                                 \\ \hline
    SELECT DISTINCT ... FROM ... AS a8 \\UNION \\SELECT DISTINCT ... FROM ... AS a1   \\ \hline
    Main query after                                                                  \\ \hline
    SELECT DISTINCT ... FROM ... AS a7\\UNION ALL\\SELECT DISTINCT ... FROM ... AS a1 \\ \hline
    \END{tabular}
\END{TABLE}