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")
select trim(leading 'x' from 'xday') as strTemp from tableName ;
select trim(trailing 'x' from 'dayx') as strTemp from tableName ;
select trim(both 'x' from 'xdayx') as strTemp from tableName ;
select trim('x' from 'xdayx') as strTemp from tableName ;
select trim(' day ') as strTemp from tableName ;