T-SQL MERGE statement is underrated

How many times did you write a SQL to save a row without knowing whether the same primary key already exists or not? You just get an object in your data access layer and you want to save all fields into the database.


SQL: produce resultset with N rows

Sometimes you need to produce a result set, which would contain N rows with numbers 1...N in each row. For example, I needed to calculate some statistics per week for N weeks starting from today and going back to the past.