系统视图 系统视图 ALL_COLUMNS ALL_OBJECTS COLUMNS DATABASES INDEXS INFORMATION_SCHEMA_TSQL.CHECK_CONSTRAINTS INFORMATION_SCHEMA_TSQL.COLUMNS INFORMATION_SCHEMA_TSQL.TABLES INFORMATION_SCHEMA_TSQL.VIEWS OBJECTS PROCEDURES SCHEMAS SYSDATABASES SYSOBJECTS SYSUSERS SYSCOLUMNS SYSINDEXES SYSINDEXKEYS TABLES VIEWS