MySQL: Partition-like function for a single set of data?...

OR clause with subquery taking too much time...

Changing a view definition improves/degrades two different queries...

SQL - how to sum groups of 15 rows and find the max sum...

SQLite query optimization: tasks selection overlapping given time window...

How to optimize a query having multiple like conditions...

Improving MySQL SELECT performance...

Very slow performing SQL case-expression (query optimization)...

SQL Optimization, Does conditions on column list affect optimization?...

Order of columns in an index...

insert on duplicate key update batch with separate update columns...

SQL Server - Reduce number of Reads...

SQL Query on a HUGE table...

What to prefer in query optimization: Using filesort or more rows examined...

Bad optimization/planning on Postgres window-based queries (partition by(, group by?)) - 1000x speed...

Use MongoDB aggregate to collect data into hierarchical results to save bandwidth...

How to optimize T-SQL query which depends on execution time?...

How can I merge these two left joins into a single one?...

How do I optimize this query that uses a seqscan in postgresql 10.3?...

Optimize query with multiple OUTER APPLY...

Is using a Subquery is the best way to use GROUP_CONCAT() on none-related table?...

Optimizing a one to many query that's using a subselect to paginate...

Modify a mysql query please...

Do I go with Big-Table with NULL values or non-NULL Multi-Tables Design?...

PostgreSQL - Optimizing query performance...

How does sql server look up in composite non-clustered index?...

PHP loops vs avg() function...

Flat table to normalized table in DB2...

Optimization of SQL query with multiple unions...

optimize the mysql query...