What a Merge Join needs and when it is fast: two sorted inputs with matching column types. Presorted B-tree indexes make it quick, extra sorts make it costly.
SQL SERVER – Restrictions of Views – T SQL View Limitations
SQL Server views come with many rules, like ANSI_NULLS and QUOTED_IDENTIFIER being on. My list of view limitations, corrected with help from Ben Taylor.
SQL SERVER – Good, Better and Best Programming Techniques
My notes for a programmers meeting on Good, Better and Best Programming Techniques in SQL Server, plus a funny bug ticket about a client who got no email.
SQL SERVER – Query to Retrieve the Nth Maximum Value
A query to retrieve the Nth Maximum Value from a table with a correlated subquery. Replace Employee and Salary with your own table and column, then set N.
SQL SERVER – Locking Hints and Examples
Locking Hints and Examples are as follows. The usage of them is the same but the effect is different. Let us learn it today together.
SQL SERVER – SELECT vs. SET Performance Comparison
SELECT vs. SET for local variables: SELECT can assign several at once and runs faster in a loop, while SET is the ANSI standard and assigns one at a time.
SQL SERVER – Difference Between Unique Index vs Unique Constraint
Unique Index vs Unique Constraint: is there a difference? No. A unique constraint creates a unique index, and performance is the same. Syntax for both.