get tablename from a set of names;

statement_buffer = 'DELETE FROM ' + tablename +
    ' WHERE high = ? AND low = ?';
EXEC SQL PREPARE del_stmt FROM :statement_buffer;

statement_buffer = 'INSERT INTO ' + tablename +
    ' VALUES (?, ?)';
EXEC SQL PREPARE ins_stmt FROM :statement_buffer;

statement_buffer = 'SELECT * FROM ' + tablename
    + ' WHERE low ?';
EXEC SQL PREPARE sel_stmt FROM :statement_buffer;

...

EXEC SQL EXECUTE del_stmt USING :high, :low;

...

EXEC SQL EXECUTE ins_stmt USING :high, :low;

...

EXEC SQL DECLARE sel_csr CURSOR FOR sel_stmt;
EXEC SQL OPEN sel_csr USING :high, :low;
loop while more rows
    EXEC SQL FETCH sel_csr INTO :high1, :low1;
    ...
end loop;