REPLACE :
replace function is:
replace( string1, string_to_replace, [ replacement_string ] )
string1 is the string to replace a sequence of characters with another set of characters.
string_to_replace is the string that will be searched for in string1.
replacement_string is optional. All occurrences of string_to_replace will be replaced with replacement_string in string1. If the replacement_string parameter is omitted, the replace function simply removes all occurrences of string_to_replace, and returns the resulting string
For example:
replace('123123tech', '123'); |
would return 'tech' |
replace('123tech123', '123'); |
would return 'tech' |
replace('222tech', '2', '3'); |
would return '333tech' |
:: extact one to one matching of character string like '123' or 'abc'
replacement character is not needed.
Translate :
translate( string1, string_to_replace, replacement_string )
string1 is the string to replace a sequence of characters with another set of characters.
string_to_replace is the string that will be searched for in string1.
replacement_string - All characters in the string_to_replace will be replaced with the corresponding character in the replacement_string.
For example:
translate('1tech23', '123', '456'); |
would return '4tech56' |
translate('222tech', '2ec', '3it'); |
would return '333tith' |
:: extact one to on e matching of character like 'a' or '1'
replace character is needed
select translate('abc132fdsf','0123456789',' ') from dual;
-------
abcfdsf
或按以下方式
SQL> select translate('abc132fdsf','#0123456789','#') from dual;
-------
abcfdsf
--提取字符串中的数字,字母都被过滤,如下:
SQL> select translate('abc132fdsf','abcdefghigklmnopqrstuvwxyz',' ') from dual;
----
132
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