anthony.green (2/8/2013)
Well you learn something new every day.That was the way I was tought back when I was a young whipper snapper, so I guess it just stuck.
Count is one of those funky aggregates. It counts the number of rows regardless of what column, or even a constant, you use as your count. There has long been a myth that counting * is slower then counting 1 but it just isn't true. I have also heard the myth that count(NullableColumn) will ignore nulls in count, this is also not true.
_______________________________________________________________
Need help? Help us help you.
Read the article at http://www.sqlservercentral.com/articles/Best+Practices/61537/ for best practices on asking questions.
Need to split a string? Try Jeff Modens splitter http://www.sqlservercentral.com/articles/Tally+Table/72993/.
Cross Tabs and Pivots, Part 1 – Converting Rows to Columns - http://www.sqlservercentral.com/articles/T-SQL/63681/
Cross Tabs and Pivots, Part 2 - Dynamic Cross Tabs - http://www.sqlservercentral.com/articles/Crosstab/65048/
Understanding and Using APPLY (Part 1) - http://www.sqlservercentral.com/articles/APPLY/69953/
Understanding and Using APPLY (Part 2) - http://www.sqlservercentral.com/articles/APPLY/69954/