So lets say I have 5 databases, all with the same schema, but different data. I want to be able to build reports based on the data in all of those databases. How could I construct a view which would ...

When databases became available for the personal computer in the mid-1980s, they quickly gained a mystique as the ultimate productivity applications. Despite their widespread use, in some ways they ...

Key-value, document-oriented, column family, graph, relational… Today we seem to have as many kinds of databases as there are kinds of data. While this may make choosing a database harder, it makes ...

Read this SQL tutorial to learn when to use SELECT, JOIN, subselects and UNION to access multiple tables with a single statement. It’s sometimes difficult to know which SQL syntax to use when ...

SQL remains the foundation for turning raw records into reports and business insights across industriesCore queries like ...

It is rare to find an implemented database devoid of reference tables. Reference tables provide valid values for drop-down lists and in a slightly obtuse way, also allow for expression of a domain or ...