SQL in 10 Minuteswas documented with you in mind. While you’re unlikely to evolve as an expert quite that fast, the book does a great job of teaching the essentials in a hurry and is broken down into 22 lessons that cover everything from basic SELECT and UPDATE statements...
Subqueries- Consider subqueries as mini-queries within your main query. They help answer questions like Who are the top 10 spenders? or Which products have above-average sales? Subqueries might seem tricky initially but become invaluable once understood. For a solid foundation in subqueries, explor...
" and Appendix D, "Basic Queries." Subqueries make it possible to use queries inside of other queries to create calculated values and specify advanced selection criteria. Cursors are used to perform row-based processing on SQL result sets. The final lesson explains how to use the techniques...