系统目录表 meaning in English

system directory list

In a relational language , such a query would require a join that might span several data tables and system catalog tables
而在关系语言中，这种查询需要进行也许跨越了多个数据表和系统目录表的联接。
Although these stored procedures and functions are specific to sql server , they insulate users from the structure of the underlying system catalog tables
虽然这些存储过程和函数为sql server所特有，但它们使用户与基础系统目录表的结构隔离开了。