An introductory SQL Server review should explain core relational ideas and how to apply them in real T-SQL queries.
Concepts and context
A primary key uniquely identifies rows. A foreign key constrains relationships. An INNER JOIN retains matching combinations; a LEFT JOIN retains unmatched left rows. GROUP BY produces aggregate groups, and HAVING filters those groups.
Practical application
Practice building a Customers table and Orders table; join them using CustomerID; group orders by customer; then inspect the query execution plan. Compare a parameterized query with a dynamic string concatenation design to understand injection risks.
Compatibility and cautions
Indexes can improve reads but add write and storage costs. Backups require tested restores. Stored procedures do not automatically make poorly constructed dynamic SQL safe.
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