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home / developersection / interviews / use of qlc with mnesia in erlang programming.
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Tarun Kumar
Tarun Kumar

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Tarun Kumar
Tarun Kumar 15 Mar 2016
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QLC stands for 'Query List Comprehension' which is used with Mnesia database, to enhance the operational ability of Mnesia. QLC having our own documentation as a part of the OTP documentation set.
Main features of QLC with Mnesia are as follows:

QLC is used to optimize the query compiler for Mnesia Database. and for making Mnesia DBMS more efficient.
QLC is used like a database programming language for Mnesia and it includes a notation called "list comprehensions" and can be used to make complex database queries over a set of tables.

QLC Syntax: [Expression || Qualifier1, Qualifier2, ...]
Expression - it is an Erlang expression (template)
Qualifiers -  these are the filters (erlang expressions) or generators (List Expressions)
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