浼樺厛綰э細綆楁湳榪愮畻錛岃繛鎺ヨ繍綆楋紝鍏崇郴榪愮畻錛?IS [NOT] NULL,LIKE,[NOT] IN),BETWEEN,NOT ,AND ,OR
1.瀛楃鎿嶄綔鍑芥暟
1)澶у皬鍐欐搷浣滃嚱鏁?br /> Lower,upper,initcap(灝忓啓 澶у啓 棣栧瓧姣嶅ぇ鍐?
2)瀛楃涓叉搷浣滃嚱鏁?br /> Concat(灝嗕袱涓瓧絎﹁繛鎺ュ埌涓璧?,length,substr(substr(瀛楃涓?m,n),m鏄粠絎嚑涓瓧絎﹀紑濮嬶紝濡傛灉涓鴻礋鐨勬剰鎬濇槸浠庡悗杈圭殑絎嚑涓紑濮嬨侼鏄暟澶氬皯涓紝濡傛灉涓嶈灝辨槸涓鐩村埌瀛楃涓茬殑緇撳熬),instr(姹傚瓙涓插湪鐖朵覆涓殑浣嶇疆錛?琛ㄧず娌℃湁鍦ㄧ埗涓蹭腑鎵懼埌璇ュ瓙涓?,trim[leading(鎴帀榪炵畫鐨勫墠緗瓧絎?,trailing(鎴帀榪炵畫鐨勫悗緗殑),both(鎴帀榪炵畫鐨勫墠緗拰鍚庣疆鐨勫瓧絎?],replace,lpad,rpad(瀛楁錛屼綅鏁幫紝'濉厖瀛楃')[宸﹂摵鍨拰鍙抽摵鍨紝20鏄誨叡閾哄灚鍒板灝戜綅錛?鏄閾哄灚鐨勫瓧絎︿覆],
3)鎿嶄綔鏁板瓧鐨勫嚱鏁?br /> ROUND(45.923,2)==45.92
TRUNC(45.923,2)==45
浠ュ皬鏁扮偣浣嶆牳蹇冿紝2鏄皬鏁扮偣鍚庝袱浣嶏紝0鍙互涓嶅啓錛岃〃紺哄彇鏁達紝-1琛ㄧず灝忔暟鐐瑰墠涓浣?br /> ROUND鏄洓鑸嶄簲鍏ワ紝TRUNC鏄埅鏂紝鍏ㄩ儴鑸嶅純銆?br /> ceil(45.001)==46
鍙栨暣錛屼笂榪涗綅錛屽拰trunc鍏ㄩ儴鍘繪帀姝ｅソ鐩稿弽
abs(-23.00) 鍙栫粷瀵瑰?br /> mod(sal,2000)鍙栦綑鏁?br /> 4)鎿嶄綔鏃ユ湡鐨勫嚱鏁?br /> 鍑芥暟SYSDATE姹傚綋鍓嶆暟鎹簱鐨勬椂闂?br /> 鏌ョ湅褰撳墠鐨勬棩鏈熸樉紺烘牸寮?br /> select * from nls_session_parameters where parameter='NLS_DATE_FORMAT';
months_between(sysdate,hiredate)涓や釜鏃ユ湡鐩稿噺鐨勭粨鏋滃崟浣嶄負澶╋紝寰寰鏄甫灝忔暟鐐廣傞氳繃鍑芥暟鍙互鍙栨暣
add_months(hiredate,6) 鍙栦袱涓棩鏈熺殑鏈堥棿闅?br /> last_day(hiredate) 璇ユ棩鏈熺殑鏈堝簳鏄摢涓澶?br /> select hiredate,round(hiredate,'yyyy') ,round(hiredate,'year') from emp;
select hiredate,trunc(hiredate,'mm') ,trunc(hiredate,'month') from emp;
鏁板瓧鐨勮繘浣嶅拰鎴彇鏄互灝忔暟鐐逛負涓績錛屾垜浠彇灝忔暟鐐瑰墠鎴栧悗鐨勫鹼紝鑰屾棩鏈熺殑榪涗綅鍜屾埅鍙栨槸浠ュ勾錛屾湀錛屾棩錛?br /> 鏃訛紝鍒嗭紝縐掍負涓績銆?br /> Any 鍜宎ll鎿嶄綔
灝忎簬all灝忎簬鏈灝忥紝澶т簬all澶т簬鏈澶?br /> 灝忎簬any灝忎簬鏈澶э紝澶т簬any澶т簬鏈灝?img src ="http://www.aygfsteel.com/instruction-pointer/aggbug/378488.html" width = "1" height = "1" />
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1. sqlplus / as sysdba
alter user system identified by oracle;
alter user sys identified by oracle; 灝唖ystem鍜宻ys鐢ㄦ埛瀵嗙爜鏀逛負oracle
鐒跺悗浣犲啀鐧誨綍sqlplus:
sqlplus /nolog /nolog鏄笉鐧婚檰鍒版暟鎹簱鏈嶅姟鍣ㄧ殑鎰忔?/span>
濡傛灉娌℃湁/nolog鍙傛暟錛宻qlplus浼氭彁紺轟綘杈撳叆鐢ㄦ埛鍚嶅拰瀵嗙爜
connect sys/oracle
2.鍦–MD 涓墽琛?font style="background-color: #a3ca9f" face="Verdana">
C:\Documents and Settings\admin>orapwd file=D:\oracle\product\10.2.0\db_1\database/PWDorcl.ora password=oracle
浼氭彁紺烘枃浠跺瓨鍦紝鎶婁互鍓嶇殑鍒犱簡灝卞彲浠ワ紝
浠ヤ笂涓ょ鏂規硶錛岀畻鏄粖澶╁涔爋racle鐨勪竴鐐瑰叆闂ㄥ惂!
鏅氫笂緇х畫瀛︿範錛屾妸絎旇鍋氬ソ錛?br />鍕夊姳鑷繁錛氬鎬葷粨錛屽杽鎬濊冿紒
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