說明:複製表(只複製結構,源表名:a新錶名:b)
sql:select*intobfromawhere1<>1
說明:拷貝表(拷貝資料,源表名:a目標表名:b)
sql:insertintob(a,b,c)selectd,e,ffromb;
sql:selecta.title,a.username,b.adddatefromtablea,(selectmax(adddate)adddatefromtablewheretable.title=a.title)b
說明:外連線查詢(表名1:a表名2:b)
sql:selecta.a,a.b,a.c,b.c,b.d,b.ffromaleftoutjoinbona.a=b.c
sql:select*from日程安排wheredatediff('minute',f開始時間,getdate())>5
說明:兩張關聯表,刪除主表中已經在副表中沒有的資訊
sql:
deletefrominfowherenotexists(select*frominfobzwhereinfo.infid=infobz.infid)
說明:--
sql:
selecta.num,a.name,b.upd_date,b.prev_upd_date
fromtable1,
(selectx.num,x.upd_date,y.upd_dateprev_upd_date
from(selectnum,upd_date,inbound_qty,stock_onhand
fromtable2
whereto_char(upd_date,'yyyy/mm')=to_char(sysdate,'yyyy/mm'))x,
(selectnum,upd_date,stock_onhand
fromtable2
whereto_char(upd_date,'yyyy/mm')=
to_char(to_date(to_char(sysdate,'yyyy/mm')¦¦'/01','yyyy/mm/dd')-1,'yyyy/mm'))y,
wherex.num=y.num(+)
andx.inbound_qty+nvl(y.stock_onhand,0)<>x.stock_onhand)b
wherea.num=b.num
說明:--
sql:
select*fromstudentinfowherenotexists(select*fromstudentwherestudentinfo.id=student.id)and系名稱='"&strdepartmentname&"'and專業名稱='"&strprofessionname&"'orderby性別,生源地,高考總成績
說明:從中去一年的各單位**費統計(**費定額賀電化肥清單兩個表**)
sql:
selecta.userper,a.tel,a.standfee,to_char(a.telfeedate,'yyyy')astelyear,
sum(decode(to_char(a.telfeedate,'mm'),'01',a.factration))asjan,
sum(decode(to_char(a.telfeedate,'mm'),'02',a.factration))asfri,
sum(decode(to_char(a.telfeedate,'mm'),'03',a.factration))a**ar,
sum(decode(to_char(a.telfeedate,'mm'),'04',a.factration))asapr,
sum(decode(to_char(a.telfeedate,'mm'),'05',a.factration))a**ay,
sum(decode(to_char(a.telfeedate,'mm'),'06',a.factration))asjue,
sum(decode(to_char(a.telfeedate,'mm'),'07',a.factration))asjul,
sum(decode(to_char(a.telfeedate,'mm'),'08',a.factration))asagu,
sum(decode(to_char(a.telfeedate,'mm'),'09',a.factration))assep,
sum(decode(to_char(a.telfeedate,'mm'),'10',a.factration))asoct,
sum(decode(to_char(a.telfeedate,'mm'),'11',a.factration))asnov,
sum(decode(to_char(a.telfeedate,'mm'),'12',a.factration))asdec
from(selecta.userper,a.tel,a.standfee,b.telfeedate,b.factration
fromtelfeestanda,telfeeb
wherea.tel=b.telfax)a
groupbya.userper,a.tel,a.standfee,to_char(a.telfeedate,'yyyy')
說明:四表聯查問題:
sql:select*fromaleftinnerjoinbona.a=b.brightinnerjoincona.a=c.cinnerjoindona.a=d.dwhere.....
說明:得到表中最小的未使用的id號
sql:
select(casewhenexists(select*fromhandlebwhereb.handleid=1)thenmin(handleid)+1else1end)ashandleid
fromhandle
wherenothandleidin(selecta.handleid-1fromhandlea)共2頁 1
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