|Oracle® Database SQL Language Reference
11g Release 2 (11.2)
|PDF · Mobi · ePub|
expr with all occurrences of each character in
from_string replaced by its corresponding character in
to_string. Characters in
expr that are not in
from_string are not replaced. The argument
from_string can contain more characters than
to_string. In this case, the extra characters at the end of
from_string have no corresponding characters in
to_string. If these extra characters appear in
expr, then they are removed from the return value.
If a character appears multiple times in
from_string, then the
to_string mapping corresponding to the first occurrence is used.
You cannot use an empty string for
to_string to remove all characters in
from_string from the return value. Oracle Database interprets the empty string as null, and if this function has a null argument, then it returns null. To remove all characters in
from_string, concatenate another character to the beginning of
from_string and specify this character as the
to_string. For example,
x') removes all digits from
TRANSLATE provides functionality related to that provided by the
REPLACE lets you substitute a single string for another single string, as well as remove character strings.
TRANSLATE lets you make several single-character, one-to-one substitutions in one operation.
This function does not support
CLOB data directly. However,
CLOBs can be passed in as arguments through implicit data conversion.
The following statement translates a book title into a string that could be used (for example) as a filename. The
from_string contains four characters: a space, asterisk, slash, and apostrophe (with an extra apostrophe as the escape character). The
to_string contains only three underscores. This leaves the fourth character in the
from_string without a corresponding replacement, so apostrophes are dropped from the returned value.
SELECT TRANSLATE('SQL*Plus User''s Guide', ' */''', '___') FROM DUAL; TRANSLATE('SQL*PLUSU -------------------- SQL_Plus_Users_Guide