对于查询关系，实例数据在设计时以手动方式填充。
For lookup relationships the instance data is manually populated at design-time.
创建查询关系需要进行一个额外的步骤，即预先填充实例数据。
Creating lookup relationships requires one more step which is pre-populating the instance data.
联接查询是关系数据库中最主要的查询，本文通过实例说明关系数据库中进行多表联接查询时联接的顺序性。
The joint query is the mainly query in the relation database. This article showed the order of the joint query on multi-tables through the example.
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