The mergeorder position for the menu item to be merged.
要合并的菜单项的合并顺序位置。
2
Also, DB2 cannot use random order index columns as part of a sort merge join.
另外，DB 2无法在排序合并合并连接中使用随机顺序的索引列。
3
As shown in the IXSCAN descriptor in Figure 8, the leading column of the index exploited by optimizer is PRODUCT_NUMBER, which does not provide the order required for merge scan join.