SELECT
sysobjects.name AS 表名称 , --------------as 的作用:为字段起一个别名
--sysproperties.[value] AS 表说明 , ----------[ ]方括号的作用:为了避免和关键字冲突
syscolumns.name AS 字段名称 ,
--properties.[value] AS 字段说明 ,
systypes.name AS 字段类型 ,
syscolumns.length AS 字段长度 ,
ISNULL(COLUMNPROPERTY(syscolumns.id, syscolumns.name,'Scale'), 0) AS 小数位数 ,
--isnull---(待测数据,返回值).当待测数据为空时返回返回值,当大策数据为非null时,反回待测数据
CASE WHEN syscolumns.isnullable=0
THEN ''
ELSE ' √ '
END AS 是否为空 ,
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 递增字段 ,
CASE WHEN sysindexes.name IS NULL
THEN ''
ELSE sysindexes.name
END AS 索引名称 ,
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 索引类型 ,
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 主键 ,
CASE WHEN sysforeignkeys.constid IS NULL
THEN ''
ELSE ' √ '
END AS 外健
FROM syscolumns -- 数据表字段
INNER JOIN sysobjects -- 数据对象
ON sysobjects.id = syscolumns.id
INNER JOIN systypes -- 数据类型
ON syscolumns.xtype = systypes.xtype
LEFT OUTER JOIN syscomments -- 注释信息
ON syscolumns.cdefault = syscomments.id
LEFT OUTER JOIN sysindexkeys -- 索引中的键或列的信息
ON sysindexkeys.id = syscolumns.id
AND sysindexkeys.colid = syscolumns.colid
LEFT OUTER JOIN sysindexes -- 数据库 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