T-SQL - Aliasing using “=” versus “as” [closed]

Answer 1

The postfix alias form (with or without the "AS") is consistent between column and table aliases. Personally, I'd like an option to enforce the use of "AS", and then you wouldn't have the situation:

select
    columnA,
    columnB
    columnC
from
    table

producing a result set with two columns instead of the expected 3.

I'd also say that with the prefix "=" form, it can make it more difficult to read if you're mixing obtaining a result set and variable assignment:

select
    cA = columnA,
    @cB = columnB,
    cC = columnC
from
    table