Optimizing sub-queries and joins...

SQL 2012 Query runs a long time, doesn't produce desired results...

I need some help to optimize a query...

Questions about multi-table query performance...

MySQL Optimize Subquery & Order By Aggregate...

Optimizing SQL query with multiple joins and grouping (Postgres 9.3)...

Optimize SQL with subquery in from...

Sybase stored procedure taking too long...

Optimize Big `IN` SQL...

Optimized SQL query when there's no physical connection between tables...

Optimizing a group by MySQL query...

Optimization of search on concatenated firstname and lastname in PostgreSQL...

Nonclustered primary key dilemma...

SQL Request time suddenly increase...

SQL Optimization: query table with different where clauses...

Is it possible to optimize these queries any more?...

Can I reuse the result of a subquery to optimize the overall query?...

Count without nested select: is this possible?...

Can I use aliases within a select statement?...

How can I join these 25 INSERT queries into just one?...

Why do I need to rollback a SELECT in mysql (InnoDB)?...

How can I improve the performance of this query?...

How to use COUNT alias in SELECT?...

MySQL - "select" query inside IN (...) optimization issue (=> Hierarquical query )...

mysql multiple record set from group by...

Can JDBC client execute SET ARITHABORT ON on Microsoft SQL Server 2012?...

Performance tuning of this query?...

Why subselect makes the SQL-request slower?...

How to optimize the following mysql query?...

Optimizing MySQL Query with "NOT IN"...