您也可以将用户添加到固定数据库角色来简化权限的分配。
You can also add users to fixed database roles to simplify assigning permissions.
算法具有多边形约简算法相同的优良的近似质量，并可在固定数据缓冲区空间内在线运算。
The quality of approximation is as good as polygonal boundary reduction, and it can process the data online in a constant buffer.
保留的扩展表字段：在每个表中预先定义固定数量的额外数据列，这些列采用通用列类型（比如 varchar）。
Reserved extended table field: Pre-define a fixed number of additional data columns in each table with a generic column type (e.g. varchar).
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