哪些删除数据库中的全体客户表(表与表之间有外键关系)

/*num name———– —-1 a2 b

除去此前先用select语句查看要被删去的数据
select *
from 表 a
where exists(select * from 表 where  花费档期的顺序=a.花费体系 and
时间>=dateadd(minute,-2,a.时间卡塔尔 and 时间<a.时间卡塔尔国

exec p015

declare roy_cursor cursor local forselect count(1)-1,num,name from
#t group by num,name having count(1)1declare @con int,@num int,@name
nvarchar(1)open roy_cursorfetch next from roy_cursor into
@con,@num,@namewhile @@fetch_status=0begin set rowcount @con; delete
#t where num=@num and name=@name set rowcount 0; fetch next from
roy_cursor into @con,@num,@nameendclose roy_cursordeallocate
roy_cursor

代码

exec p016

declare @max integer,@id integerdeclare cur_rows cursor local for
select 主字段,count(*) from 表名 group by 主字段 having count(*)
1open cur_rowsfetch cur_rows into @id,@maxwhile
@@fetch_status=0beginselect @max = @max -1set rowcount @maxdelete
from 表名 where 主字段 = @idfetch cur_rows into @id,@maxendclose
cur_rowsset rowcount 0

要是有重复的字段为name,address,须求赢得这四个字段独一的结果集
select identity(int,1,1) as autoid, * into #tmp from tablename
select min(autoid) as autoid into #tmp2 from #tmp group by
name,autoid
select * from #tmp where autoid in(select autoid from #tmp2)

exec up_011

方法1:

方法三

1、由表名求字段名
create proc up_008(@table varchar(20))
as
begin
        declare @sql varchar(99)
    select @sql=\’select name from syscolumns where id=object_id(\’
    select @sql=@sql+\’\’\’\’+@table+\’\’\’\’+\’)\’
    –select @sql
    exec(@SQL)
end

–重新推行测验数据后用方法3主意3:

delete from 表 a
where exists(select * from 表 where  开销体系=a.花费项目 and
时间>=dateadd(minute,-2,a.时间卡塔尔国 and 时间<a.时间State of Qatar

–declare @sql varchar(99)
–select @sql=\’alter table Orders drop constraint
FK_Orders_澳门新萄京,Customers\’
–exec(@SQL)

//使用函数

去除重复数据sql语句
方法一

exec up_008 a_idx2
2、编制程序删除数据库中的顾客表
create proc up_010
as
begin
        declare @sql varchar(99),@tbl varchar(30),@fk varchar(30)
   declare cur_fk cursor local for
      select object_name(constid),object_name(fkeyid) from
sysreferences
   –删除全体外键
   open cur_fk
   fetch cur_fk into @fk,@tbl
   while @@fetch_status =0
   begin
                select @sql=\’alter table \’+@tbl+\’ drop constraint
\’+@fk
      exec(@SQL)
      –select @sql=\’drop table \’+@tbl
      fetch cur_fk into @fk,@tbl
   end
   close cur_fk
   declare cur_fks cursor local for
      select name from sysobjects where xtype=\’U\’
   open cur_fks
   fetch cur_fks into @tbl
   while @@fetch_status =0
   begin
      select @sql=\’drop table [\’+@tbl+\’]\’
      exec(@SQL)
      fetch cur_fks into @tbl
   end
   close cur_fks  
end

*/

方法一
假使有重复的字段为name,address,必要赢得那多个字段独一的结果集 select
identity(int,1,1卡塔尔国 as autoid, * into #tmp from t…

4 求表中两行记录之差
—–求表中两条记下之差
create table a099
(
id int,
qty int
)

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