How do I replace all my NULL values in a particular field in a particular table?
I've looked all over the internet for my answer, and perhaps I'm just doing things wrong. I have a column in my MySQL table that I need to replace all the NULL values with a text string in my SQL Query using phpMyAdmin. I don't want the output to come out that way, I want to actually replace the null values with the text string.
I've tried
UPDATE `tablename` SET fieldname开发者_运维问答 = replace (fieldname, "", "textstring")
I've read up on
SELECT ISNULL(field,"replacetext)
But this only shows the output, but doesn't actually replace it in the table.
I can't figure this out, and I've wasted so much time trying to find an answer.
update tablename set fieldname = "textstring" where fieldname is null;
Have you tried
UPDATE `tablename` SET fieldname = '' where fieldname is null
精彩评论