Query priority 查询优先级
The row order in the query elements table in which columns are defined determines their left to right sequence within the order BY clause, which in turn determines their sorting priority.
定义了列的查询元素表中的行顺序决定了它们在ORDER BY子句中从左到右的顺序，这又确定了它们的排序优先级。
The query optimizer will give priority to an execution plan involving an MQT over a plan that involves access to remote tables.
对于涉及到 MQT 的执行计划，并且该 MQT 是涉及远程表访问的计划上的 MQT，查询优化器给予它优先权。
A query operation, such as the lsuser command, will be done to the base DNs according to their priority until a matching account is found.
将根据其优先级对基本DN执行查询操作，如lsuser命令，直到找到了匹配的帐户。
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