系统视图ALL_COLUMNSALL_OBJECTSCOLUMNSIDENTITY_COLUMNSDATABASESINDEXSINFORMATION_SCHEMA_TSQL.CHECK_CONSTRAINTSINFORMATION_SCHEMA_TSQL.COLUMNSINFORMATION_SCHEMA_TSQL.TABLESINFORMATION_SCHEMA_TSQL.VIEWSOBJECTSPROCEDURESSCHEMASSYSDATABASESSYSOBJECTSSYSUSERSSYSCOLUMNSSYSINDEXESSYSINDEXKEYSTABLESVIEWS