Assuming knowledge of basic computing, I would say the progression for a beginner is as follows: html, css, javascript, backend language of your choice (php,asp,etc.), databases/SQL. You can stop here if all you want to do is build a website, just keep in mind that web programming is only one branch on the massive tree of computer programming.
It should also be noted that building a website is also an exercise in graphic design, writing, and user interaction design. Anyone of those other facets can be equally difficult to learn and master.
Not sure I agree with that order. I personally know people who have learned SQL before php or other backend language. You make a good point about the other elements in website building. It can be invaluable to have a good designer/user interface expert type on your team. In my experience _most_ hacker types are weaker in those areas, myself included.
It should also be noted that building a website is also an exercise in graphic design, writing, and user interaction design. Anyone of those other facets can be equally difficult to learn and master.