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Databases are used as backend infrastructure component almost everywhere. There are different technologies to access data from databases and different spots in architectures, where you find databases in applications.

There are also conventions you may want to obey, patterns you may want to use and special constructs in SQL you might never heard of.

Amongst the multitude of databases out there, you might already know Microsoft Access, Microsoft SQL Server and Oracle.

Databases are usually queried with SQL statements, but you also might have come across some code in VBA, which makes use of different technologies.