Many people are confused by various JOIN operations supported by SQL. Learn to master the SQL command line with this crash course in JOIN syntax.

Read this SQL tutorial to learn when to use SELECT, JOIN, subselects and UNION to access multiple tables with a single statement.

Both of these have roots in early CODASYL specifications. The third sub-language in SQL declares queries, through the SELECT statement and relational joins.

Even if generative AI hides SQL behind the curtain, it will continue to play a critical role in how we interact with and use data.

Joey on SQL Server Deep Dive into SQL Server 2022's Query Performance Features, Part 2: PSP Optimization Reduce workload times with this handy feature that can benefit every database pro.