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

select 'drop table '+name+';' from sys.tables 
where name like 'DataSyncV1DelaySample%' 
or name like 'DataSyncV2DelaySample%'

2、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

3、数字类型转为字符串

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