I presented a session on SQL Server indexes at Microsoft User Group Hyderabad, led by Hima Vindu Vejella. The index talk was very well received.
SQL SERVER – Introduction to Rollup Clause
An introduction to the Rollup Clause in SQL Server, which aggregates at several levels of a hierarchy. A population table by country, state and city shows how.
Data Mining Algorithms (Analysis Services – Data Mining)
I quite often receive requests for the Data Mining Algorithms details. Book Online has wonderful resources for the same. I suggest to read them here.
geometry STOverlaps: Intersection Alone Is Not Enough
geometry STOverlaps asks a narrower question than whether two shapes share any points. I test equal and contained regions alongside a partial overlap. Those intersecting cases do not all satisfy the method’s overlap definition.
SQL SERVER- IF EXISTS(Select null from table) vs IF EXISTS(Select 1 from table)
Is IF EXISTS(Select null from table) faster than IF EXISTS(Select 1 from table)? A great comment thread by Divya, Brian and Marko answers it.
SQL SERVER – Recompile Stored Procedure at Run Time
Two ways to recompile a stored procedure at run time in SQL Server: add WITH RECOMPILE when you create it, or ask for a one-time recompile.
Mapping MySQL Data Types to SQL Server
Mapping MySQL data types requires checking signed ranges, text encoding, date limits, and application behavior before choosing SQL Server columns.