LAST_VALUE changes with its window frame. Compare implicit and whole-partition frames, order tied rows and preserve a final NULL.
BIT_COUNT: Count Set Bits Without Changing Integer Width
BIT_COUNT counts active positions in a typed value. Keep integer width visible and distinguish a missing mask from a zero count.
SQL SERVER – Definition, Comparison and Difference between HAVING and WHERE Clause
I asked every candidate the difference between HAVING and WHERE clause, and none got it right. HAVING filters groups, while WHERE filters individual rows.
SQL SERVER – Comparison : Similarity and Difference #TempTable vs @TempVariable
#TempTable and @TempVariable both live in tempdb, but they differ in scope and purpose. Their similarities and differences, explained side by side.
SQL SERVER – 2005 Comparison SP_EXECUTESQL vs EXECUTE/EXEC
SP_EXECUTESQL vs EXECUTE/EXEC in SQL Server 2005: what they share for dynamic SQL, like late compile and variable scope, and how they differ.
SQL SERVER – Explanation of WITH ENCRYPTION clause for Stored Procedure and User Defined Functions
Use WITH ENCRYPTION to hide the code of a stored procedure or UDF, but keep a copy of the script. Once encrypted, there is no simple way to decrypt it.
SQL SERVER – Fix : Error : Server: Msg 131, Level 15, State 3, Line 1 The size () given to the type ‘varchar’ exceeds the maximum allowed for any data type (8000)
Msg 131 says the size given to varchar exceeds the maximum allowed (8000). Use VARCHAR(8000), or VARCHAR(MAX) in SQL Server 2005 as the TEXT replacement.