使用SUBSTRING 函数: SUBSTRING(string FROM start FOR length):从指定的起始位置开始,截取指定长度的子字符串。 SUBSTRING(string FROM pattern FOR escape):根据正则表达式模式截取子字符串。 示例: sql SELECT SUBSTRING('Hello World' FROM 1 FOR 5) AS substring_result; -- 输出: Hello SELECT SUBSTRING('...
PostgreSQL 提供了三种实现模式匹配 的方法:SQL LIKE 操作符,更近一些的 SIMILAR TO 操作符(SQL:1999 里添加进来的), 和POSIX-风格正则表达式。 另外还有一个模式匹配函数 substring 可以用, 它可以使用 SIMILAR TO 提示:如果你的模式匹配的要求比这些还多,或者想写一些模式驱动的 替换和转换,请考虑用 Perl 或 ...
public String substring(int beginIndex) 返回该字符串从beginIndex开始到结尾的子字符串; public String substring(int beginIndex,int endIndex) 返回该字符串从beginIndex开始到endsIndex结尾的子字符串 oracle中也有substring,相比来说功能要更丰富,注意在java中是substring,而在oracle是substr [ora11g@rac1 ~]$ ksh...
1. 使用 SUBSTRING 函数：可以使用 SUBSTRING 函数来截取字符串的子串。语法如下：SELECT SUBSTRING('your_string' FROM start_position FOR length);例如，SELECT SUBSTRING('Hello, World' FROM 1 FOR 5); 这将返回 'Hello'。2. 使用 SPLIT_PART 函数：SPLIT_PART 函数可以根据指定的分隔符将字符串分割成多个...
Note that regex # will not works with 8i database, use % placeholder instead Ora2Pg will use # the NOT LIKE operator. There is also some extended use of this directive, # see chapter "Limiting object to export" in documentation....
/// /// 去除所有HTML标记 /// public static string DeleteHtmlTag(string html) { html = Regex.Replace(html, @"]*?>[\s\S]*?&... sql 数据库截取字符串 用到substring() 函数,charindex() 函数... select substring('123,456',charindex(',','123,456') ,len('123.456')-3) 结果: ...
For example, you can ban from export some unwanted function with this directive: EXCLUDE write_to_.* send_mail_.* this example will exclude all functions, procedures or functions in a package with the name beginning with those regex. Note that regex will not work with 8i database, you ...
Note that regex will not works with 8i database, you must use the % placeholder instead, Ora2Pg will use the LIKE operator. This is the manner to declare global filters that will be used with the current export type. You can also use extended filters that will be applied on specific ...
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_tbregex name; _subtbl name; _grps name; _gfmt name; _tfmt name; _tmp integer; _cursor refcursor; BEGIN -- 确保只能从比汇聚时间小一个级别的数据中进行汇聚 IF _tgrp = 'H1' THEN _grps = '1Hour'; _gfmt = 'YYYYMMDDHH24'; _tfmt = 'YYYYMMDDHH24..'; ...