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trim()函数的用法

在oracle中,trim()函数的用法有,leading 开头字符,trailing 结尾字符,both 开头和结尾字符,如下:

trim(leading || trailing || both ‘将要被替换掉的字符" from “将要被替换的字符串")

1、trim函数去除指定的开头字符

select trim(leading ‘x‘ from ‘xday‘) as strTemp from tableName ;

2、trim函数去除指定的结尾字符

select trim(trailing ‘x‘ from ‘dayx‘) as strTemp from tableName ;

3、trim函数去除指定的首部和尾部字符

select trim(both ‘x‘ from ‘xdayx‘) as strTemp from tableName ;

4、默认情况下,trim函数会去除首部和尾部,被指定的字符

select trim(‘x‘ from ‘xdayx‘) as strTemp from tableName ;

5、如果没有指定被移除的字符,则会默认去除首部和尾部的空格

select trim(‘ day ‘) as strTemp from tableName ;


trim()函数的用法