sql server 删除所有表和递归查询、数字类型转为字符串

1、删除所有表

DECLARE c1 cursor for
select 'alter table ['+ object_name(parent_obj) + '] drop constraint ['+name+']; '
from sysobjects
where xtype = 'F'
open c1
declare @c1 varchar(8000)
fetch next from c1 into @c1
while(@@fetch_status=0)
begin
exec(@c1)
fetch next from c1 into @c1
end
close c1
deallocate c1

declare @sql varchar(8000)
while (select count(*) from sysobjects where type='U')>0
begin
SELECT @sql='drop table ' + name
FROM sysobjects
WHERE (type = 'U')
ORDER BY 'drop table ' + name
exec(@sql)
end

2、删除所有存储过程

declare @tname varchar(8000)
set @tname=''
select @tname=@tname + Name + ',' from sysobjects where xtype='P'
select @tname='drop proc ' + left(@tname,len(@tname)-1)
exec(@tname)
go

3、删除所有视图

declare @tname varchar(8000)
set @tname=''
select @tname=@tname + Name + ',' from sysobjects where xtype='V'
select @tname='drop view ' + left(@tname,len(@tname)-1)
exec(@tname)
go

4、递归查询 使用关键字with as

 with temp ( [Id], [parentid])
    as
    (
        select Id, ParentId
        from SysLocation
        where ParentId = @ParentId
        union all
        select a.Id, a.ParentId
        from SysLocation a
        inner join temp on a.ParentId = temp.[Id]
    )

    select s.Id, s.ParentId from SysLocation s where Id=@ParentId
    union all
    select * from temp

5、数字类型转为字符串

select convert(varchar(11),convert(decimal(11,0),mo)) as m  from test

6、创建外键

alter table ResolvedOrderNew
add constraint FK_ResolvedOrderNew_QuotaOrderNew
foreign key (QuoteOrderNewId) references QuoteOrderNew(Id);