Getting The Top Value Per Group In SQL Server: Row Number vs. Cross Apply Performance

Introductions


There are many ways to express queries in SQL. How different rewrites perform will largely be a function of:

  • You not doing anything ridiculous
  • Queries having good indexes in place
  • The optimizer not seeing through your tricks and giving

Using Batch Mode for the “Matching Supply With Demand” Challenge

Itzik Ben-Gan posted an interesting T-SQL challenge on SQL performance dot com. I’m writing up my solution in my own blog post because I have a lot to say and getting code formatting right can be tricky in blog post …