I'm sure this is a good resource and will very well repay the time to work through it, but what a job will most likely want is actual industry, hands-on experie

I'm sure this is a good resource and will very well repay the time to work through it, but what a job will most likely want is actual industry, hands-on experience. Learning SQL from a book/website is very valuable, but it's not enough. Working with large, real datasets where the SQL optimiser has decided that it doesn't like your face today, well, you need lots of those headaches before you get expert. I realise that often leaves people in the tough position of "can't get a job without experience, can't get experience without a job". Sorry, I don't know what to suggest. But good luck and don't let me put you off!