1.
MS sql server中使用动态的表名：declare @tableName nvarchar(160)
set @tableName = 't_stat_all'
declare @sql nvarchar(160)
print @tableName
set @sql='select count(*) from '+@tableName
exec(@sql)

2.mysql的例子1
语句update (select sc,tos,sum(click) as click,product,adpid from log_sc_click group by sc,tos,product,adpid) as a,
t_stat_sc_h_tmp as b
set b.sc_click=a.click
where b.stat_date=str_date and b.hour=str_hour and b.sc=a.sc
and b.tos=a.tos and b.product=a.product and a.adpid=b.adpid;

3.mysql例子2
update t_advertiser as a,
    (select uid,sum(amount) as amount from t_trade where status='1' and type='4' group by uid)as b
    set a.spend=(b.amount) ,a.balance=(a.totalAmount-b.amount)    #注意是逗号不是and
    where a.id=b.uid;

4.
SQL server存储过程完整例子

set ANSI_NULLS ON
set QUOTED_IDENTIFIER ON
go

--ALTER procedure [dbo].[ad_stat]
ALTER procedure [dbo].[ad_stat]
@day varchar(20) = null

as
BEGIN try

if(@day is null)
set @day = convert(varchar(10),dateadd(day,-1,getdate()),121)

declare @theDay datetime
set @theDay = cast(@day as datetime)

declare @yesterday varchar(10)
set @yesterday = convert(varchar(10),@theDay,121)

declare @tableName nvarchar(160)
set @tableName = 'log_adlist_'+ left(@yesterday,4)+'_'+substring(@yesterday,6,2)+'_'+substring(@yesterday,9,2)

declare @sql nvarchar(500)
set @sql=' update t_stat_all '+
' set cl=b.click from '+
' ( '+
' select AllType as ad_id ,posid as posid,count(*) as click '+
' from '+@tableName+
' where datediff(d,VisitTime,'+@theDay+')=0'+
' group by AllType,posid '+
' ) b ,t_stat_all a '+
' where datediff(d,a.stat_date,'+@theDay+')=0 and a.posid=b.posid '+
' and a.ad_id=b.ad_id ';
exec(@sql)

END try
begin catch
INSERT INTO actionLogs
([createTime]
,[actionName]
,[type]
,[infor])
VALUES
(getdate(),
'ad_stat',
'error', --error,info
ERROR_MESSAGE())
end catch