系统视图ALL_COLUMNSALL_OBJECTSCOLUMNSDATABASESINDEXSINFORMATION_SCHEMA_TSQL.CHECK_CONSTRAINTSINFORMATION_SCHEMA_TSQL.COLUMUSINFORMATION_SCHEMA_TSQL.TABLESINFORMATION_SCHEMA_TSQL.VIEWSOBJECTSPROCEDURESSCHEMASSYSOBJECTSSYSUSERSSYSCOLUMNSSYSINDEXESSYSINDEXKEYSTABLESVIEWS