銆愮ず渚嬨?select instr('oracle traning','ra',1,2) instring from dual;
8 LENGTH(c1) lengthB
銆愬姛鑳姐戣繑鍥炲瓧絎︿覆鐨勯暱搴?
銆愯鏄庛戝瀛楄妭絎?姹夊瓧銆佸叏瑙掔絳?錛屾寜1涓瓧絎﹁綆?
銆愬弬鏁般慍1 瀛楃涓?
銆愯繑鍥炪戞暟鍊煎瀷
銆愮ず渚嬨憇elect length('aaaa'),length('ccccccccc'),length('bbbbbbbbbbb') from dual;
PS: Length鍑芥暟榪斿洖瀛楃鐨勪釜鏁幫紝浣跨敤瀹氫箟鏄粰瀹氱殑瀛楃闆嗘潵璁$畻瀛楃鐨勪釜鏁?
LENGTHB緇欏嚭璇ュ瓧絎︿覆鐨刡yte
LENGTHC浣跨敤綰疷nicode
LENGTH2浣跨敤UCS2
LENGTH4浣跨敤UCS4
Select lengthB('浣犲ソ'),lengthC('浣犲ソ'),length2('浣犲ソ'), length4('浣犲ソ') from dual;
9 LPAD(c1,n[,c2]) RPAD(c1,n[,c2])
銆愬姛鑳姐戝湪瀛楃涓瞔1鐨勫乏銆佸彸杈圭敤瀛楃涓瞔2濉厖錛岀洿鍒伴暱搴︿負n鏃朵負姝?
銆愬弬鏁般慍1 瀛楃涓?
銆愮ず渚嬨憇elect lpad('gao',10,'*aaaaaaaaaaaaaaaaaaa') from dual;
select lpad('gao',10) from dual;
select rpad('gao',10,'*aaaaaaaaaaaaaaaaaaa') from dual;
select rpad('gao',10) from dual;
10 LTRIM(c1,[,c2]) RTRIM(c1,[,c2])
銆愬姛鑳姐戝垹闄ゅ瓧絎︿覆c1宸﹁竟鎴栬呭彸杈規(guī)寚瀹氱殑瀛楃涓?
銆愬弬鏁般慶2 涓烘寚瀹氱殑瀛楃涓?
銆愯繑鍥炪?br />
銆愮ず渚嬨憇elect LTRIM('bin hui hui','bin') text from dual;
select RTRIM('huuihuiXXXX','X') text from dual;
11 REPLACE(c1,c2[,c3])
銆愬姛鑳姐戝皢瀛楃琛ㄨ揪寮忓間腑錛岄儴鍒嗙浉鍚屽瓧絎︿覆錛屾浛鎹㈡垚鏂扮殑錛堟垨鑰呮槸鍒犻櫎錛夊瓧絎︿覆
銆愬弬鏁般慶1 甯屾湜琚浛鎹㈢殑瀛楃鎴栧彉閲? c2 琚浛鎹㈢殑瀛楃涓?c3 瑕佹浛鎹㈢殑瀛楃涓詫紝榛樿涓虹┖(鍗沖垹闄や箣鎰忥紝涓嶆槸絀烘牸)
銆愯繑鍥炪戝瓧絎﹀瀷
銆愮ず渚嬨憇elect replace('he love you','love','hates') test from dual;
select replace('he love you','he') test from dual;
12 SUBSTR(c1,n1[,n2])
銆愬姛鑳姐戝彇瀛愬瓧絎︿覆
銆愯鏄庛戝瀛楄妭絎?姹夊瓧銆佸叏瑙掔絳?錛屾寜1涓瓧絎﹁綆?
銆愬弬鏁般戝湪瀛楃琛ㄨ揪寮廲1閲岋紝浠巒1寮濮嬪彇n2涓瓧絎?鑻ヤ笉鎸囧畾n2,鍒欎粠絎瑈涓瓧絎︾洿鍒扮粨鏉熺殑瀛椾覆.
銆愯繑鍥炪戝瓧絎﹀瀷
銆愮ず渚嬨憇elect substr('13088888888',3,8) test from dual;
select substr('13088888888',3) test from dual;
13 TRIM(c1 from c2)
銆愬姛鑳姐戝垹闄ゅ乏杈瑰拰鍙寵竟鍑虹幇鐨勫瓧絎︿覆
銆愬弬鏁般慍2 鍒犻櫎鍓嶅瓧絎︿覆 c1 鍒犻櫎瀛楃涓?榛樿涓虹┖鏍?
銆愯繑鍥炪戝瓧絎﹀瀷
銆愮ず渚嬨憇elect TRIM('X' from 'XXXgao qian jingXXXX'),TRIM('X' from 'XXXgaoXXjingXXXX') text from dual;
select trim (' bbbbbbbbbbb ') from dual