更改表将文本添加到非空值

Question

Can someone give me an example of how I can alter a table value that has text inside already, and keep that text but add new text in front of the existing text? I'm trying to add additional text to 1600+ fields.

I was looking at MySQL and found reference to concatenate CONCAT , but as I understand, it adds text after a certain value.

Answer 1

If you want to change the value of a column use the UPDATE statement:

update myTable set myColumn = concat('some text before', myColumn, 'some text after') where <where condition>

Answer 2

You can add text where you want. Just concatenate them in the way you like.

select *,concat('your_text ',field) as new_text from table 

or

select *,concat(field,' your_text') as new_text from table 

It exists also concat_ws() function where ws means "with separator".

select *,concat_ws(' ','your_text',field) as new_text from table.

Once you're sure you've the right new content convert the select in an update query. It's always a good practice trying the equivalent select before doing some mistake with update queries.

update table set field = concat('new text ',field)
where field is not null or field <> ""