SQL Tutorial - Single Value Subqueries | Database Tutorial 5m
In this lecture of the databases course we learn about single value subqueries in SQL. A subquery that returns a single value (that is, a single row and a single column) can be used like an atomic value in SQL. It can be compared to atomic values (e.g. attribute values) in the WHERE clause, and it can even be placed in the SELECT clause.
This is the databases online course given at the Vrije Universiteit Amsterdam by Jörg Endrullis. The course objective is to obtain a good understanding of relational database systems from the user perspective. This includes the ability to develop conceptual database models, as well as key concepts and skills in relational database theory and practice.
Among others, we treat in this course the following subjects:
(a) entity–relationship diagrams for the design of database schemata,
(b) the relational database model and integrity constraints,
(c) SQL (structured query language) for retrieving information from relational databases,
(d) database normalisation and functiona dependencies (reasoning about good database design),
(e) transactions and concurrency control.
The slides are based on work by Peter Boncz and Torsten Grust.
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