Help me to optimize hard logic on SQL...

Computing number of days which fall between predefined date ranges...

Need to see if a range of dates overlaps another range of dates in sql...

Eliminating a Cross Join in SQL...

Optimise multiple OR query...

Rewrite IN subquery as JOIN...

SQL Optimization...

LINQ or Entity Framework creates unbounded SQL statement...

Most optimized way to get column totals in SQL Server 2005+...

Optimizing queries for a database using SQL/XML. Suggested resources?...

Database Optimization techniques for amateurs...

How do I select a random record efficiently in MySQL?...

Has anyone ever successfully make index merge work for MySQL?...

SQL Server sproc query optimization...

What's faster IN or OR?...

SQL (any) Request for insight on a query optimization...