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lang-sql
idis not primary key. So, even though you are not counting you still need to find all matching records, possibly thousands of them. About aliasing - code is constant work in progress. You never know when you'll have to go back. Aliasing helps preventing stupid runtime errors; for example, unique column name that didn't need an alias is not unique any more because somebody created a column of same name in another, joined table.aliasing. Correct term isqualifying. Here is longer explanation by Alex Kuznetzov. About single table queries - it is single table now. But later, when bug is discovered and you are trying to hold the flood, client is nervous, you join another table just to face error message - easily correctable message, but not at this sweaty moment, a small stroke strikes - and you correct the error remembering never to leave a column ...