REGEXP_SUBSTR 结合 CONECT BY LEVEL 代码语言:sql AI代码解释 SELECTregexp_substr(temp.STUDENT,'[^,]+',1,level)STUDENTFROM(SELECT'Student001,Student002,Student003'STUDENTFROMdual)tempCONNECTBYlevel<=REGEXP_COUNT('Student001,Student002,Student003','[^,]+');--Student001--Student002--Student003 ...
@文心快码oracle regexp_substr 分割字符串 文心快码 在Oracle数据库中,regexp_substr函数是一个非常强大的工具,它允许我们根据正则表达式模式从字符串中提取子字符串。以下是对你问题的详细回答: 解释regexp_substr函数在Oracle中的用途: regexp_substr函数主要用于从字符串中提取满足指定正则表达式模式的子字符串。它...
2)在oracle中rownum和level都是自动生成数字序列集合,结合connect by使用 selectDISTINCT regexp_substr('A,B,C,D,E,F','[^,]+',1,level)fromDUAL connect by level<= length('A,B,C,D,E,F') - length(replace('A,B,C,D,E,F',',','')) +1;selectDISTINCT regexp_substr('A,B,C,D,E,...
需要返回多行,可以采用oracle的connect by 命令,行数的获得通过length来获得。 select regexp_substr(‘2001,2002,200103,2005’, ‘[^,]+’, 1, level, ‘i’) as str from dual connect by level <= length(‘2001,2002,200103,2005’) - length(regexp_replace(‘2001,2002,200103,2005’, ‘,’,...
SELECT LEVEL FROM DUAL CONNECT BY LEVEL <=7; 结果: www.2cto.com LEVEL --- 1 2 3 4 5 6 7 4、将上面REGEXP_SUBSTR的occurrence关联 [sql] SELECT NVL(REGEXP_SUBSTR('17,20,23', '[^,]+', 1, LEVEL, 'i'), 'NULLL') AS STR FROM...
如果你想将一个由分号分隔的字符串分割为多行,你可以使用REGEXP_SUBSTR结合TABLE函数和CAST: 代码语言:javascript 复制 SELECTREGEXP_SUBSTR('A;B;C;D','[^;]+',1,LEVEL)ASitemFROMdualCONNECTBYLEVEL<=REGEXP_COUNT('A;B;C;D','[^;]')+1; ...
Oracle中的regexp_substr函数可以用于提取字符串中符合指定模式的子串,常用于复杂查询中对字符串的处理。以下是regexp_substr函数在复杂查询中的使用技巧:1. 提取字符串中...
The Oracle REGEXP_SUBSTR() function is an advanced version of the SUBSTR()function that allows you to search for substrings based on a regular expression. Instead of returning the position of the substring, it returns a portion of the source string that matches the regular expression. Syntax ...
可以使用regexp_substr方法来实现这一功能: ```sql SELECT regexp_substr('This is a test. My em本人l is xxx and another em本人l is xxx', '[A-Za-z0-9._+-]+[A-Za-z0-9.-]+\.[A-Za-z]{2,4}', 1, level) AS em本人l FROM dual CONNECT BY regexp_substr('This is a test. ...
Oracle CONNECT BY根据特定字符拆分字符串 1、一行 SELECT T.ID, REGEXP_SUBSTR(T.VALS,'[^,]+',1, LEVEL) AS VAL FROM (SELECT'101'ID,'A,B'VALS FROM DUAL) T CONNECT BY LEVEL<= REGEXP_COUNT(T.VALS,'[^,]+'); 2、多行 2-1、如果ID唯一不重复:...