sql取字符串中间的字符串/取字符串‘adfaadsfa’第二到第五个字母 sql 获取字符串的首字母是按什么规则
SQL\u4e2d\uff0c\u53d6\u5b57\u7b26\u4e32\u4ece\u53f3\u8fb9\u7b2c2\u4e2a\u5b57\u7b26\u5230\u5de6\u8fb9\u7684\u6240\u6709\u5b57\u7b26\uff0c\u6c42\u8bed\u53e5\uff1fSQL\u4e2d\uff0c\u53d6\u5b57\u7b26\u4e32\u4ece\u53f3\u8fb9\u7b2c2\u4e2a\u5b57\u7b26\u5230\u5de6\u8fb9\u7684\u6240\u6709\u5b57\u7b26\u53ef\u4ee5\u53c2\u8003\u4e0b\u9762\u7684\u4ee3\u7801\uff1a
oracle
select substr('\u5b57\u7b26\u4e32',0,Len('\u5b57\u7b26\u4e32')-2) from dual;
Sql Server
select substr('\u5b57\u7b26\u4e32',0,Len('\u5b57\u7b26\u4e32')-2)
\u6269\u5c55\u8d44\u6599\uff1a
sql\u8bed\u53e5
\u66f4\u65b0\uff1aupdate table1 set field1=value1 where \u8303\u56f4
\u67e5\u627e\uff1aselect * from table1 where field1 like \u2019%value1%\u2019 \uff08\u6240\u6709\u5305\u542b\u2018value1\u2019\u8fd9\u4e2a\u6a21\u5f0f\u7684\u5b57\u7b26\u4e32\uff09
\u6392\u5e8f\uff1aselect * from table1 order by field1,field2 [desc]
\u6c42\u548c\uff1aselect sum(field1) as sumvalue from table1
\u53c2\u8003\u8d44\u6599\u6765\u6e90\uff1a\u767e\u5ea6\u767e\u79d1-SQL\u8bed\u53e5\u5927\u5168
\u5982\u679c\u662f\u5728\u4e00\u4e2a\u5b57\u7b26\u4e32\u4e2d\u627e\u51fa\u7b2c\u4e00\u4e2a\u5b57\u6bcd\uff0c\u53ef\u7528REGEXP_INSTR\u51fd\u6570\u6765\u5b9e\u73b0\u3002
\u4f8b\uff1aSELECT REGEXP_INSTR('123Arter','[[:alpha:]]') FROM dual;
\u8fd4\u56de\u7ed3\u679c\u662f4\u3002
绛旓細3銆佹煡璇㈣〃涓叏閲忔暟鎹紝select t.*, rowid from test_int t;4銆佺紪鍐sql锛鑾峰彇瀛楃涓蹭腑鐨鎸囧畾瀛楃;select t.*,case when instr(value, 'd=') = 0 then null else substr(value,instr(value, 'd='),case when instr(value, '&') = 0 then 10 else instr(value, '&') - instr(value...
绛旓細Expression1鏄鍒癳xpression2涓鎵鐨勫瓧绗︿腑,start_location鏄疌HARINDEX鍑芥暟寮濮嬪湪expression2涓壘expression1鐨勪綅缃 substring鍑芥暟璋冪敤鏂规硶濡備笅: substring(string,startNumber, endNumber) 杩斿洖绗竴涓弬鏁颁腑浠庣浜屼釜鍙傛暟鎸囧畾鐨勪綅缃紑濮嬨佺涓変釜鍙傛暟鎸囧畾鐨勯暱搴︾殑瀛瀛楃涓銆 渚嬪瓙: CHARINDEX('SQL', 'Microsoft SQL Serv...
绛旓細绫讳技鎴戞槰澶╁洖绛旇繃鐨勯棶棰樸傝璁℃濊矾锛氭妸 25锛堥渶鍖归厤鐨勬暟鎹級锛屽墧鍑烘帀銆傚墧鍑哄悗锛岃繛缁繛涓楀彿锛屾垨棣栭楀彿锛屾垨灏鹃楀彿锛岄兘璇存槑鍙惈鏈夐渶鍖归厤鐨勬暟鎹俿elect 鍏朵粬瀛楁 from (select 鍏朵粬瀛楁,replace(瀛楁,'25','') as tt from 琛ˋA)where tt like in (',%',',,','%,')鎴 where tt like ',...
绛旓細鏄竴涓暣鏁帮紝鎸囧畾瀛愪覆鐨勯暱搴︼紙瑕佽繑鍥鐨勫瓧绗鏁版垨瀛楄妭鏁帮級銆俿ubstring()鈥斺斾换鎰忎綅缃彇瀛愪覆 left()right()鈥斺斿乏鍙充袱绔彇瀛愪覆 ltrim()rtrim()鈥斺旀埅鏂┖鏍硷紝娌℃湁trim()銆俢harindex()patindex()鈥斺旀煡瀛愪覆鍦ㄦ瘝涓蹭腑鐨浣嶇疆锛屾病鏈夎繑鍥0銆傚尯鍒細patindex鏀寔閫氶厤绗︼紝charindex涓嶆敮鎸併傚嚱鏁板姛鏁堬細瀛楃涓鎴彇...
绛旓細濂戒箙娌℃湁鍐欒繃SQL浜嗭紝鑺变簡涓涓皬鏃舵妸浣犵殑闂瑙ｅ喅浜嗭紝鍔20鍒嗭紝蹇紒CREATE TABLE [#tmp] ([鏁板瓧] [varchar] (35) COLLATE Chinese_PRC_CI_AS NULL ,) ON [PRIMARY]declare @Len int set @Len=1 declare @hen int set @hen=1 while @hen>0 begin SELECT @hen=CHARINDEX('-', substring(...
绛旓細鍙互杩欐牱锛屽涓哄瓧娈靛垯鐢ㄥ瓧娈靛悕鏇挎崲@str鍗冲彲 declare @str varchar(50)set @str = '2012-07:鐢佃〃(00300):鍗曚环[锟1.30]*鐢ㄩ噺[9000.00]';select substring(@str,charindex('锟',@str,1)+ 1,charindex(']',@str,charindex('锟',@str,1)) - charindex('锟',@str,1) -1) as 鍗曚环,subs...
绛旓細鍔4锛堣繖涓瓧绗︿覆鐨勯暱搴︼級锛岀劧鍚庢埅鍙栧叾涔嬪悗鍒扮涓変釜鐨勯暱搴鐨勫瓧绗︿覆銆傝繖鏄痵ubstring 鐨刟piSUBSTRING锛string,start_position,[length]锛 姹傚瓙瀛楃涓诧紝杩斿洖瀛楃涓茶В閲婏細string 鍏冨瓧绗︿覆 start_position 寮濮嬩綅缃紙浠0寮濮嬶級 length 鍙夐」锛屽瓙瀛楃涓茬殑涓暟 ...
绛旓細--鏂规硶涓replace鍑芥暟鍘绘帀寮曞彿灏辨槸娌℃湁寮曞彿瀛楃涓:select replace(zh,''','') from 琛 --濡傛灉鐪熻鎴彇鐨勮瘽涔熸槸鍙互鐨. 鍏坙eft鍘绘帀鏈鍚庝竴涓紩鍙,鐒跺悗stuff鍘绘帀绗竴涓紩鍙峰嵆鍙 select stuff(left(zh,len(zh)-1),1,1,'') from 琛 濡傛湁闂鍙互杩介棶锛屾垜褰撳強鏃跺洖绛斻傚笇鏈涜兘甯埌浣狅紒
绛旓細charindex(')',select 瀛楁鍚 from 琛ㄥ悕 where id=1))-charindex('(',select 瀛楁鍚 from 琛ㄥ悕 where id=1)))灏辨槸涓や釜鍑芥暟 substring("1231",1,2) ="12" 1璧峰浣嶇疆 2鎴彇闀垮害 charindex('(','ab(cd')=3 鑾峰彇鍦ㄥ瓧娈'ab(cd' 涓橈紙鈥欏瓧绗﹀湪瀛楃涓蹭腑鐨绱㈠紩浣嶇疆 ...
绛旓細A.鎴彇鎸囧畾瀛楃涓插悗鐨勫瓧绗︿覆(渚嬪鎴彇http://鍚庨潰鐨勫瓧绗︿覆)鏂规硶涓:浠ヤ笅鏄唬鐮佺墖娈碉細Declare @S1 varchar(100)Select @S1='http://www.xrss.cn'Select Substring(@S1,CHARINDEX('www',@S1)+1,Len(@S1))--- 鏄剧ず缁撴灉: www.163.com 闇瑕佹敞鎰:CHARINDEX鍑芥暟鎼滅储瀛楃涓叉椂,涓嶅尯鍒嗗ぇ灏忓啓,鍥犳CHARI...
