update block set committee=null, groundarea=null, buildingarea=null, publicarea=null, otherdept=null, builddate=null, managedept=null, heatdept=null, memo=null, tem1=null, tem2=null, tem3=null where name!='志新小区'
update downwater2 set diameter=null,length=null where address!='志新小区'
update downwater1 set builddate=null,material=null,alllength=null where address!='志新小区'