Interview Questions and Answers Part 6 covers the six properties of relational tables and de-normalization, adding redundant data to help performance.
SQL Server Interview Questions and Answers Part 3
Interview Questions and Answers Part 3 opens with NOLOCK: how the hint skips read locks, why that means dirty reads, and what it does for concurrency.
SQL Server Interview Questions and Answers Part 2
Interview Questions and Answers Part 2 explains clustered vs non-clustered indexes and the index configurations a table can have. The updated set has moved.
SQL SERVER – SQL Commandments – Suggestions, Tips, Tricks
My 20 SQL Commandments for SQL Server, rewritten from an Oracle article: know your data, test with realistic data, write identical statements, and more tips.
SQL SERVER – Primary Key Constraints and Unique Key Constraints
Primary Key and Unique Key both enforce uniqueness, but they differ in the index they create and in NULL handling. Here are the differences and the scripts.
SQL SERVER – ReIndexing Database Tables and Statistics with Targeted Maintenance
ReIndexing Database tables starts with a measured maintenance need. I check the workload before choosing an index operation.
SQL SERVER – Query to Display Foreign Key Relationships and Name of the Constraint for Each Table in Database
A long query on INFORMATION_SCHEMA views that shows foreign key relationships for each table: the table, column, referenced table and the constraint name.