Removing unwanted character from column

I would like to remove the character '�' from column

Column Name:

asds�dfg开发者_开发技巧dfg

dfgwer�werwer

And Want to replace it with space

Column Name:

asds dfgdfg

dfgwer werwer

That is a Unicode replacement character. If this character is appearing in your table then it might be that you are issuing queries using the wrong character set. You should check the column character set, and you should also check the character set(s) of the connection(s) you use to issue queries. If there is a difference in connection character set between connections used to read and record data, or if there is a difference in expected character set between applications/scripts used to access the data, that would explain the presence of these characters.

If you just want to replace it with a space:

UPDATE myTable SET myColumn = REPLACE(myColumn, '�', ' ')

Replace below characters

~ ! @ # $ % ^ & * ( ) _ +
` - = 
{ } |
[ ] \
: " 
; '

< > ?
, . 

with this SQL

SELECT note as note_original, 

    REPLACE(
        REPLACE(
            REPLACE(
                REPLACE(
                    REPLACE(
                        REPLACE(
                            REPLACE(
                                REPLACE(
                                    REPLACE(
                                        REPLACE(
                                            REPLACE(
                                                REPLACE(
                                                    REPLACE(
                                                        REPLACE(
                                                            REPLACE(
                                                                REPLACE(
                                                                    REPLACE(
                                                                        REPLACE(
                                                                            REPLACE(
                                                                                REPLACE(
                                                                                    REPLACE(
                                                                                        REPLACE(
                                                                                            REPLACE(
                                                                                                REPLACE(
                                                                                                    REPLACE(
                                                                                                        REPLACE(
                                                                                                            REPLACE(
                                                                                                                REPLACE(
                                                                                                                    REPLACE(
                                                                                                                        REPLACE(
                                                                                                                            REPLACE(
                                                                                                                                REPLACE(
                                                                                                                                    REPLACE(note, '"', ''),
                                                                                                                                '.', ''),
                                                                                                                            '?', ''),
                                                                                                                        '`', ''),
                                                                                                                    '<', ''),
                                                                                                                '=', ''),
                                                                                                            '{', ''),
                                                                                                        '}', ''),
                                                                                                    '[', ''),
                                                                                                ']', ''),
                                                                                            '|', ''),
                                                                                        '\'', ''),
                                                                                    ':', ''),
                                                                                ';', ''),
                                                                            '~', ''),
                                                                        '!', ''),
                                                                    '@', ''),
                                                                '#', ''),
                                                            '$', ''),
                                                        '%', ''),
                                                    '^', ''),
                                                '&', ''),
                                            '*', ''),
                                        '_', ''),
                                    '+', ''),
                                ',', ''),
                            '/', ''),
                        '(', ''),
                    ')', ''),
                '-', ''),
            '>', ''),
        ' ', '-'),
    '--', '-') as note_changed FROM invheader

Execute below query to set charset

SET CHARSET 'utf8';
set names 'utf8'

Use this query to change the charset: SET CHARSET 'utf8';

You Can Try this for multiple column

 UPDATE myTable
SET    myColumn1 = Replace(myColumn1, '�', ' '),
       myColumn2 = Replace(myColumn2, '�', ' '),
       myColumn3 = Replace(myColumn3, '�', ' '),
       ...;