MySQL从整列中删除所有空格

Question

有没有办法从特定列中删除所有值的所有空格？

Answer 1

要替换all spaces:

UPDATE `table` SET `col_name` = REPLACE(`col_name`, ' ', '')

要删除所有tabs字符:

UPDATE `table` SET `col_name` = REPLACE(`col_name`, '\t', '' )

要删除所有new line字符:

UPDATE `table` SET `col_name` = REPLACE(`col_name`, '\n', '')

http://dev.mysql.com/doc/refman/5.0/en/string-functions.html#function_replace

要删除first and last space(s)列:

UPDATE `table` SET `col_name` = TRIM(`col_name`)

http://dev.mysql.com/doc/refman/5.0/en/string-functions.html#function_trim

Answer 2

因为问题是如何替换所有空格

UPDATE `table` 
SET `col_name` = REPLACE
(REPLACE(REPLACE(`col_name`, ' ', ''), '\t', ''), '\n', '');

Answer 3

工作查询:

SELECT replace(col_name , ' ','') FROM table_name;

虽然这不是:

SELECT trim(col_name) FROM table_name;