then DB2 could use the four-column index the "traditional" way (index, table, index, table, etc.) to return the rows in the desired order (the same order as or the reverse order of the index).
然后，DB2 可以以 “传统” 方法（索引、表、索引、表，等等）使用这个 “4 列” 索引以期望的次序（与索引相同或相反的顺序）返回所需行。
youdao