Remove numbers found in string column

问题

What would be the SQL to remove all numbers found in an otherwise string column using Sqlite (an Oracle example would be appreciated too)?

Example : I would like to remove all numbers from entries like this :

291 HELP,1456 CALL

Expected output:

HELP,CALL

edit: I have edited the question because it is not only from one entry that I want to remove numbers but many of them.

回答1:

Either you do it in the language, you embedded sqlite, or you use this SQLite code, that removes all numbers:

UPDATE table SET column = replace(column, '0', '' );
UPDATE table SET column = replace(column, '1', '' );
UPDATE table SET column = replace(column, '2', '' );
UPDATE table SET column = replace(column, '3', '' );
UPDATE table SET column = replace(column, '4', '' );
UPDATE table SET column = replace(column, '5', '' );
UPDATE table SET column = replace(column, '6', '' );
UPDATE table SET column = replace(column, '7', '' );
UPDATE table SET column = replace(column, '8', '' );
UPDATE table SET column = replace(column, '9', '' );

回答2:

select '''' || regexp_replace('123 help 321', '\d+') || '''' from dual;

回答3:

Using TRANSLATE and REPLACE

SQL> WITH DATA AS(
  2  SELECT '291 HELP' str FROM dual UNION ALL
  3  SELECT '1456 CALL' str FROM dual
  4  )
  5  SELECT REPLACE(translate(str, '0123456789', ' '), ' ', NULL) str
  6  FROM DATA
  7  /

STR
---------
HELP
CALL

SQL>

Using REGEXP_REPLACE

SQL> WITH DATA AS(
  2  SELECT '291 HELP' str FROM dual UNION ALL
  3  SELECT '1456 CALL' str FROM dual
  4  )
  5  SELECT trim(regexp_replace(str, '[0-9]+')) str
  6  FROM DATA
  7  /

STR
---------
HELP
CALL

SQL>

POSIX character class

SQL> WITH DATA AS(
  2  SELECT '291 HELP' str FROM dual UNION ALL
  3  SELECT '1456 CALL' str FROM dual
  4  )
  5  SELECT trim(regexp_replace(str, '^[[:digit:]]+')) str
  6  FROM DATA
  7  /

STR
---------
HELP
CALL

SQL>

Perl-extensions

SQL> WITH DATA AS(
  2  SELECT '291 HELP' str FROM dual UNION ALL
  3  SELECT '1456 CALL' str FROM dual
  4  )
  5  SELECT trim(regexp_replace(str, '\d+')) str
  6  FROM DATA
  7  /

STR
---------
HELP
CALL

SQL>

来源：https://stackoverflow.com/questions/28656220/remove-numbers-found-in-string-column

标签

sql

Oracle

sqlite

replace

regexp-replace