Oracle、Mysql、SqlServer创建表和给表和字段加注释

Oracle、Mysql、SqlServer创建表和给表和字段加注释 
一、Oracle
--创建表
create table test ( 
     id varchar2() primary key not null,
     sort number, 
     name varchar()
)
--字段加注释
comment on column test.id is 'id'; 
comment on column test.sort is '序号';
--表加注释
comment on table test is '测试表' 
--------------------------------------------------------------------------------------
 二.Mysql
--创建表
create table test ( 
     id varchar() not null,
     sort int() comment '排序',
     name varchar() comment  '名称',
)           
--表加注释
alter table test comment ='测试表' 
---------------------------------------------------------------------------------------
三.SqlServer
--创建表
create table test ( 
     id varchar() primary key not null,
     sort int,
     name varchar(),
)
--给字段加注释
EXEC sp_addextendedproperty N'test', N'序号', N'user', N'dbo', N'table', N'test', N'column', N'sort';
--表加注释
EXECUTE sp_addextendedproperty N'test', N'测试表', N'user', N'dbo',N'table', N'test', NULL, NULL 
删除字段注释  
execute sp_dropextendedproperty 'MS_Description','user','dbo','table','testTable','column','testRecord';  
删除表注释  
execute sp_dropextendedproperty 'MS_Description','user','dbo','table','testTable',null,null;   
---------------------------------
sqlserver
--表加注释
EXECUTE sp_addextendedproperty N'MS_Description', N'账号类型表', N'user', N'dbo',N'table', N'Account_Type', NULL, NULL 
--获取表注释
SELECT isnull(B.name,'')as name,A.value FROM sys.extended_properties A
LEFT JOIN sys.columns B ON A.major_id=B.object_id AND A.minor_id=B.column_id
LEFT JOIN sys.tables C ON A.major_id=C.object_id
WHERE A.class= AND C.name='Account_Type' and isnull(B.name,'')=''
--给字段加注释
EXEC sp_addextendedproperty N'MS_Description', N'序号', N'user', N'dbo', N'table', N'Account_Type', N'column', N'Type_Id';
--获取字段注释
SELECT A.value FROM sys.extended_properties A
LEFT JOIN sys.columns B ON A.major_id=B.object_id AND A.minor_id=B.column_id
LEFT JOIN sys.tables C ON A.major_id=C.object_id
WHERE A.class= AND B.name='Type_Id' AND C.name='Account_Type'