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Rounding to DATETIME components

Sometimes you need to round DateTimes in T-SQL to a certain DateTime component. For example, you need to truncate the minutes and seconds and only keep the date and the hour. To do so, you can do this:

SELECT DATEADD(hh, DATEDIFF(hh, '20000101', getdate()), '20000101')

This turns 20120101 13:59:59 into 20120101 13:00:00. Please note that the comparison date 20000101 is totally arbitrary. You can use any day before the date you’re truncating.

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Transpose lines into comma separated strings

Sometimes you need to return from a stored procedure the results of a SELECT as a comma-separated string.

Example: The SELECT returns:
Hello
World
It's
Me

But you want the stored procedure to return:
Hello, World, It's, Me

Instead of looping with a cursor you can solve this pretty elegantly like the following:

The AND Field IS NOT NULL at the end of the WHERE-clause is important, because otherwise the result would always be null if one of the values was null (because something + NULL = NULL).