Appending data to a MySQL database field that already has data in it

Question

I need to \"add\" data to a field that already contains data without erasing whats currently there. For example if the field contains HTML, I need to add additional HTML to

Answer 1

UPDATE Table SET Field=CONCAT(Field,'your extra html');

Answer 2

UPDATE myTable SET html=concat(html,'<b>More HTML</b>') WHERE id='10' 

... for example. Your WHERE would be different of course.

Answer 3

Append at the end of a field, separated with with a line break:

UPDATE Table SET Comment = CONCAT_WS(CHAR(10 USING UTF8), Comment, 'my comment.');

• CONCAT_WS() appends multiple strings separated by a given separator.
• CHAR(10, UTF8) is a line break.

Answer 4

UPDATE Table SET Field=CONCAT(IFNULL(Field, ''), 'Your extra HTML')

If the field contains NULL value then CONCAT will also return NULL. Using IFNULL will help you to update column even it has NULL value.