SELECT
sysobjects.name AS 表名稱 , --------------as 的作用:為字段起一個別名
--sysproperties.[value] AS 表說明 , ----------[ ]方括號的作用:為了避免和關鍵字沖突
syscolumns.name AS 字段名稱 ,
--properties.[value] AS 字段說明 ,
systypes.name AS 字段類型 ,
syscolumns.length AS 字段長度 ,
ISNULL(COLUMNPROPERTY(syscolumns.id, syscolumns.name,'Scale'), 0) AS 小數位數 ,
--isnull---(待測數據,返回值).當待測數據為空時返回返回值,當大策數據為非null時,反回待測數據
CASE WHEN syscolumns.isnullable=0
THEN ''
ELSE ' √ '
END AS 是否為空 ,
CASE WHEN syscomments.text IS NULL
THEN '' ELSE syscomments.text
END AS 缺省值 ,
CASE WHEN COLUMNPROPERTY(syscolumns.id, syscolumns.name, 'IsIdentity')= 1
THEN ' √ ' ELSE ''
END AS 遞增字段 ,
CASE WHEN sysindexes.name IS NULL
THEN ''
ELSE sysindexes.name
END AS 索引名稱 ,
CASE WHEN sysindexkeys.keyno IS NULL
THEN ''
ELSE CONVERT(VARCHAR(10),sysindexkeys.keyno )
END AS 索引位置 ,
CASE WHEN sysindexes.indid=1
THEN ' 聚集索引 '
WHEN sysindexes.indid>1 AND sysindexes.indid<>255
THEN ' 非聚集索引 '
WHEN sysindexes.indid IS NULL
THEN ''
ELSE
' 其他 '
END AS 索引類型 ,
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 ' √ ' ELSE ''
END AS 主鍵 ,
CASE WHEN sysforeignkeys.constid IS NULL
THEN ''
ELSE ' √ '
END AS 外健
FROM syscolumns -- 數據表字段
INNER JOIN sysobjects -- 數據對象
ON sysobjects.id = syscolumns.id
INNER JOIN systypes -- 數據類型
ON syscolumns.xtype = systypes.xtype
LEFT OUTER JOIN syscomments -- 注釋信息
ON syscolumns.cdefault = syscomments.id
LEFT OUTER JOIN sysindexkeys -- 索引中的鍵或列的信息
ON sysindexkeys.id = syscolumns.id
AND sysindexkeys.colid = syscolumns.colid
LEFT OUTER JOIN sysindexes -- 數據庫 索引表
ON sysindexes.id = sysindexkeys.id
AND sysindexes.indid = sysindexkeys.indid
LEFT OUTER JOIN sysforeignkeys
ON sysforeignkeys.fkeyid = syscolumns.id
AND sysforeignkeys.fkey = syscolumns.colid
WHERE (sysobjects.xtype = 'U')
order by sysobjects.id,syscolumns.colid