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

i have a syslog collector setup to push all events from many processes into a database. taking one process, squid, i'm trying to put the Message column from the SystemEvents table into another ...

SQL Server 2016 and Azure SQL Database both give you tables that automatically keep track of changes to your data. Here's how to both create those tables and alter existing tables so they track the ...

Recursive SQL can be very elegant and efficient. However, because of the difficulty developers can have understanding recursion, it is sometimes thought of as 'too inefficient to use frequently.' But, ...

Designing an appropriate set of indexes can be one of the more troubling aspects of developing efficient relational database applications. Perhaps, the most important thing you can do to assure ...

Using default values on database columns helps to insulate database design issues from application code. Find out how to change a column's default value at a later date using a single command.