Q:

MySQL MD5 with column variable and salt

What is the syntax for MySQL MD5 with multiple variables and or salt? 
Table column works as below
UPDATE table SET hash = md5(column)

Salt works as below
UPDATE table SET hash = md5('salt')

How do I combine these?  As the following doesn't work
UPDATE table SET hash = md5(column,'salt')

I could not see an example in the MySQL reference manual.  I have tried spaces, dots and + sign. 
EDIT: This has nothing to do with passwords so please keep comments related to the post and not education on BCrypt. 

A:

You can use CONCAT function for values concatenation.  For example:
UPDATE table SET hash = md5(CONCAT(column,'salt'));

