The data type of a column in the recursive member must be the same as the data type of the corresponding column in the anchor member.
递归成员中列的数据类型必须与定位点成员中相应列的数据类型一致。
UNION ALL is the only set operator allowed between the last anchor member and first recursive member, and when combining multiple recursive members.
在最后一个定位点成员和第一个递归成员之间，以及组合多个递归成员时，只能使用UNIONALL集合运算符。
Since member items need to be valid objects prior to their inclusion in larger structures, the simplest recursive descent approach would not work.
由于在成员项所包含的内容出现在较大型的结构之前，成员项必须是有效对象，所以最简单的递归继承方法不起作用。
Since member items need to be valid objects prior to their inclusion in larger structures, the simplest recursive descent approach would not work.
由于在成员项所包含的内容出现在较大型的结构之前，成员项必须是有效对象，所以最简单的递归继承方法不起作用。
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