SQL server添加表和字段注释

--加表注释写法: 
EXEC sp_addextendedproperty N'MS_Description', N'用户登录表', N'SCHEMA', N'dbo',N'TABLE', N'IN_ID_LFA_PERSISTENCY';
--例： 
EXEC sp_addextendedproperty N'MS_Description', N'注释', N'SCHEMA', N'用户',N'TABLE', N'表名';
--修改表注释: 
EXEC sp_updateextendedproperty N'MS_Description', N'注释', N'SCHEMA', N'用户',N'TABLE', N'表名';
--删除表注释: 
execute sp_dropextendedproperty 'MS_Description','user','dbo','table','表名称';

--加字段注释写法： 
EXEC sp_addextendedproperty N'MS_Description', N'注释', N'SCHEMA', N'用户',N'TABLE', N'表名', N'COLUMN', N'字段';
--例： 
EXEC sp_addextendedproperty N'MS_Description', N'DC Code', N'SCHEMA', N'dbo',N'TABLE', N'IN_ID_LFA_PERSISTENCY', N'COLUMN', N'DC';
--修改字段注释 
execute sp_updateextendedproperty 'MS_Description','注释内容1', 'user','dbo','table','表名','column','字段名';
--删除字段注释 
execute sp_dropextendedproperty   'MS_Description','user','dbo','table','表名','column','字段名';

--查看表的详细信息
SELECT
     表名       = Case When A.colorder=1 Then D.name Else '' End,
     表说明     = Case When A.colorder=1 Then isnull(F.value,'') Else '' End,
     字段序号   = A.colorder,
     字段名     = A.name,
     类型       = B.name,
     字段说明   = isnull(G.[value],''),
     标识       = Case When COLUMNPROPERTY( A.id,A.name,'IsIdentity')=1 Then '√'Else '' End,
     主键       = Case When exists(SELECT 1 FROM sysobjects Where xtype='PK' and parent_obj=A.id and name in (SELECT name FROM sysindexes WHERE indid in( SELECT indid FROM sysindexkeys WHERE id = A.id AND colid=A.colid))) then '√' else '' end,
     占用字节数 = A.Length,
     长度       = COLUMNPROPERTY(A.id,A.name,'PRECISION'),
     小数位数   = isnull(COLUMNPROPERTY(A.id,A.name,'Scale'),0),
     允许空     = Case When A.isnullable=1 Then '√'Else '' End,
     默认值     = isnull(E.Text,'')
 FROM
     syscolumns A  Left Join systypes B                    On A.xusertype=B.xusertype
                  Inner Join sysobjects D                On A.id=D.id  and D.xtype='U' and  D.name<>'dtproperties'
                   Left Join syscomments E                On A.cdefault=E.id
                   Left Join sys.extended_properties  G On A.id=G.major_id and A.colid=G.minor_id
                   Left Join sys.extended_properties F  On D.id=F.major_id and F.minor_id=0
 where d.name='IN_ID_LFA_PERSISTENCY'    --如果只查询指定表,加上此条件
 Order By
     A.id,A.colorder;

--查看表简单信息	 
  SELECT
A.name AS 表名,
B.name AS 表字段,
C.value AS 字段注释
FROM sys.tables A
INNER JOIN sys.columns B ON B.object_id = A.object_id
LEFT JOIN sys.extended_properties C ON C.major_id = B.object_id AND C.minor_id = B.column_id
WHERE A.name = 'sys_user';--表名称