根據sqlservice自動生產代碼核心語句

SELECT  Sysobjects.name AS TABLE_NAME ,
								syscolumns.Id  AS TABLE_ID,
								syscolumns.name AS COLUMN_NAME ,
								systypes.name AS DATA_TYPE ,
								syscolumns.length AS CHARACTER_MAXIMUM_LENGTH ,
								sys.extended_properties.[value] AS COLUMN_DESCRIPTION ,
								syscomments.text AS COLUMN_DEFAULT ,
								syscolumns.isnullable AS IS_NULLABLE,
                                (case when exists(SELECT 1 FROM sysobjects where xtype= 'PK' and name in ( 
                                SELECT name FROM sysindexes WHERE indid in( 
                                SELECT indid FROM sysindexkeys WHERE id = syscolumns.id AND colid=syscolumns.colid 
                                ))) then 1 else 0 end) as IS_PRIMARYKEY

								FROM    syscolumns
								INNER JOIN systypes ON syscolumns.xtype = systypes.xtype
								LEFT JOIN sysobjects ON syscolumns.id = sysobjects.id
								LEFT OUTER JOIN sys.extended_properties ON ( sys.extended_properties.minor_id = syscolumns.colid
																			 AND sys.extended_properties.major_id = syscolumns.id
																		   )
								LEFT OUTER JOIN syscomments ON syscolumns.cdefault = syscomments.id
								WHERE   syscolumns.id IN ( SELECT   id
												   FROM     SYSOBJECTS
												   WHERE    xtype in( 'U','V') )
								AND ( systypes.name <> 'sysname' ) AND Sysobjects.name='tablename'  AND systypes.name<>'geometry' AND systypes.name<>'geography'  ORDER BY syscolumns.colid

來自sqlsugar的源碼，大佬就是大佬，碼怪！