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('Hello World' FROM ' ...
'字符串被成功转换为全大写形式。 4. substring(string from start for length): 从字符串中提取子字符串 substring函数允许我们从字符串中提取指定位置和长度的子字符串。它通常用于数据清洗和字符串分割等场景。 代码样例: SELECTsubstring('Hello, World!'from8for5)ASsub_string;-- 结果: 'World' 1. 2. ...
函数:substring(string [from int] [for int]) 说明:Extract substring 截取任意长度的子字符串 例子:select substring('topmars' from 3 for 3); = "pma" 函数:substring(string from pattern) 说明:Extract substring matching POSIX regular expression. See Section 9.7 for more information on pattern matchi...
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...
/// /// 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: ...
PG_SUPPORTS_SUBSTR Some versions of PostgreSQL like Redshift doesn't support substr() and it need to be replaced by a call to substring(). In this case, disable it. PG_SUPPORTS_NAMED_OPERATOR Disable this directive if you are using PG < 9.5, PL/SQL operator used in named parameter =>...
PG_SUPPORTS_SUBSTR Some versions of PostgreSQL like Redshift doesn't support substr() and it need to be replaced by a call to substring(). In this case, disable it. PG_SUPPORTS_NAMED_OPERATOR Disable this directive if you are using PG < 9.5, PL/SQL operator used in named parameter =>...
("db_status",'active',"dbname",null),1,128) can easily be replaced by the PostgreSQL equivalent: substring((CASE WHEN "db_status"='active' THEN "dbname" ELSE NULL END) from 1 for 128)) The problem could comes when you introduce subquery into one of the substr() or decode() ...
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....
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 'new String("ABcd").substring(1)' ...