Wayne Sheffield

My blog about SQL Server

Browsing Posts in Myth

Understanding the relationship between statistics, indexes and constraints in SQL Server. What meaning does stats_id of 1 mean?

Well, here it is again. The second Tuesday of the month, which means that it’s T-SQL Tuesday. This month, Dev Nambi (blog | twitter) is hosting the party, and he has decided that the topic is to be on Assumptions. Specifically, he wants us to write about: A big assumption you encounter at work, one […]

The Myth One misconception that I see a lot deals with how data is stored in a clustered index. Specifically – is the data in a clustered index stored on the page in physical order? Most people will say “Yes”, and they get this from the definition (see BOL: Clustered and Nonclustered Indexes Described), which […]

One thing that I have seen repeatedly is that (too) many people believe that if you have a clustered index on a table, that you can run a SELECT statement without an ORDER BY clause from that table and the results will be in the order of the clustered index key. Nope, this is absolutely […]

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