How to Compare Date in SQL Server Query? Finding All Rows Between Two Dates

It's tricky to use dates in SQL server query, especially if you don't have good knowledge of how DateTime type works in SQL server. For example, one of the frequently asked SQL queries on the interview is to "select all rows where the date is 20151007?" How would you do that? Does following SQL Query will work correctly

select * from table where date = '20151007'

It may or may not, it entirely depends on upon data in your table. When you only provide date part of a DateTime variable, it uses '00:00:00.000' for time part.
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