Update joomla metada keywords from MySQL 'update' query

Problem:   

You are too lazy to update keywords from article manager in the backend, and need a quick option to do that without installing any random plugin that do that for you (I found that plugins don't works as you except).

 Solution:    

Go to MySQL administrator page and open your SQL windows to write a new SQL query to update your keywords, the joomla table / field where are stored meta about SEO keywords is _content , and the fieldname is "metakey".
Now with that you only need to run that sample SQL query to update SEO keywords.

SQL Query:

UPDATE *_content SET metakey = 'keyword1,'keyword2,'keyword3,'keyword4,'keyword5'

*Take careful that this query will update all your articles, if you would like to make some filter remember to use SQL conditions like WHERE id=x...