Update model SQLs for Teradata

[adamtwo]

What are you changing in this pull request and why?

The original Teradata quickstart that we contributed before the launch had several discrepancies. This PR reflects the early feedback from the people who tried to complete the quickstart.

Checklist

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[mirnawong1]

hey @adamtwo thanks for openign this up! I've approved it but have a couple of small suggestions. i can't make those changes myself - can you make those tweaks on your end?

[adamtwo]

hey @adamtwo thanks for openign this up! I've approved it but have a couple of small suggestions. i can't make those changes myself - can you make those tweaks on your end?

Thanks for the suggestions, I've accepted them. I'm good to merge the PR.