In MySQL, replace all the data for every record for only one column

Question

I have a table like this

    A    |    B    |    C    <----columns
x   0    |    -    |    -
y   0    |    -    |    -
z   0    |    -    |    -

I want to replace all the 0 with -, something like a foreach would do it, but I want to do it with SQL (if possible).

In my actual problem here theres hundreds of rows, so by hand would be bad lol. I could probably crack it with some php but I suspect theres a thingy in MySQL that does this.

Answer 1

Do you just mean

update mytable set A="-" where A="0";

?

Answer 2

update table tablename set A="-" where A="0"

Answer 3

Are you looking for this?

UPDATE mytable
SET a = 123
WHERE a = 0

Or replace 123 with whatever you want, like '-'.