nvl 榪囨煡璇㈣幏寰楁煇涓瓧孌電殑鍚堣鍊鹼紝濡傛灉榪欎釜鍊間綅null灝嗙粰鍑轟竴涓璁劇殑榛樿鍊?br /> select nvl(sum(t.dwxhl),1) from tb_jhde t where zydm=-1
榪欓噷鍏沖績鐨刵vl鐨勭敤娉曪紝nvl錛坅rg,value錛変唬琛ㄥ鏋滃墠闈㈢殑arg鐨勫間負null閭ｄ箞榪斿洖鐨勫間負鍚庨潰鐨剉alue 銆?
鍙︿竴涓湁鍏崇殑鏈夌敤鏂規硶
declare
i integer
select nvl(sum(t.dwxhl),1) into i from tb_jhde t where zydm=-1
榪欐牱灝卞彲浠ユ妸鑾峰緱鐨勫悎璁″煎瓨鍌ㄥ埌鍙橀噺i涓紝濡傛灉鏌ヨ鐨勫間負null灝辨妸瀹冪殑鍊艱緗負榛樿鐨? 銆?br />
GREATEST
鍔熻兘: 闆嗗悎涓殑鏈澶у?
鎬濊礬: 紜畾絎竴涓弬鏁版槸浠涔堢被鍨?涔嬪悗鎵鏈夌殑鍙傛暟鍏ㄩ儴杞崲鎴愯繖縐嶇被鍨嬪啀姣旇緝.
娉ㄦ剰:
(1) 鍙傛暟鍙兘鏄泦鍚?涓嶈兘鏄瓙鏌ヨ.
(2) 騫朵笖鍙夋嫨絎竴涓瓧絎︽渶澶х殑.
鍑芥暟:
FUNCTION GREATEST (pattern NUMBER) return NUMBER;
pragma BUILTIN('GREATEST',12,240,240);-- This is special cased in PH2 -- Pj
function GREATEST (pattern VARCHAR2 CHARACTER SET ANY_CS)
return VARCHAR2 CHARACTER SET pattern%CHARSET;
pragma BUILTIN('GREATEST',12,240,240);-- This is special cased in PH2 -- Pj
function GREATEST (pattern DATE) return DATE;
pragma BUILTIN('GREATEST',12,240,240);-- This is special cased in PH2 -- Pj
渚嬪瓙:
SELECT GREATEST(SELECT gb.set_of_books_id FROM gl_sets_of_books gb)
FROM dual
--ORA-00936: missing expression
SELECT GREATEST(100,1,3,11)FROM dual;
--100
SELECT GREATEST('100',1,3,11)FROM dual;
--3
SELECT GREATEST('a',1,3,11)FROM dual;
--'a'
SELECT GREATEST('abc','bcd','cde','cda')FROM dual;
--'cde'
--榪欓噷鍙槸
SELECT GREATEST(100,1,'3',11)FROM dual;
--100
SELECT GREATEST(100,1,3,'a')FROM dual;
--ORA-01722: invalid number
--鏃犳晥鏁板瓧
start with……connect by
閮ㄩ棬branch_code涓庤惀涓氶儴sub_branch_cod鍏崇郴浜屽弶鏍戝涓嬶細
0
01 02
011 012 021 022
0111 0112 0121 0122 0211 0212 0221 0222
* start with 鐢ㄤ簬鎸囧畾鏌ヨ鐨勬牴琛?br /> * connect by 鐢ㄤ簬鎸囧畾鐖惰涓庡瓙琛岀殑鍏崇郴
* PRIOR 鍦ㄦ潯浠惰〃杈懼紡涓紩瀵肩埗琛?br /> * lpad 鍑芥暟鐢ㄦ潵濉厖瀛楁涓插乏杈圭殑浣嶇疆錛屼粠鑰岃揪鍒版牸寮忓寲鐨勭洰鐨?br /> * where 鐢ㄤ簬榪囨護鏌ヨ緇撴灉
--鏌ヨ璇彞錛?br /> SQL> select lpad(branch_code,LENGTH(branch_code)+(LEVEL*2)-2,'_') as branch
2 from test_11
3 where branch_code <> '0000'
4 start with branch_code='0'
5 connect by PRIOR sub_branch_code=branch_code
6 /
BRANCH
--------------------------------------------------------------------------------
0
__01
____012
____012
__01
____011
____011
0
__02
____021
____021
__02
____022
____022
14 rows selected
intersect榪愮畻顥?
榪斿洖鏌ヨ緇撴灉涓浉鍚岀殑閮ㄥ垎顥?
(鍚勪釜閮ㄩ棬涓湁鍝簺鐩稿悓鐨勫伐縐?顥?
select job from account intersect select job from research
intersect
select job from sales;顥?
minus榪愮畻顥?
榪斿洖鍦ㄧ涓涓煡璇㈢粨鏋滀腑涓庣浜屼釜鏌ヨ緇撴灉涓嶇浉鍚岀殑閭ｉ儴鍒嗚璁板綍銆?br /> 顥?
(鏈夊摢浜涘伐縐嶅湪璐細閮ㄤ腑鏈夛紝鑰屽湪閿鍞儴涓病鏈夛紵)顥?
select job from account顥?
minus顥?
select job from sales;顥?br />
鍙栧洓鑸嶄簲鍏ョ殑鍑犱綅灝忔暟
round(n+0.{m涓?}5, m)
姣斿錛?鍙栦袱浣嶇殑璇?
round(15.333 + 0.005, 2)
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