Home > DeveloperSection > Interviews > Use of QLC with Mnesia in Erlang programming.

Posted on    March-15-2016 1:23 AM

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Tarun Kumar

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Posted on    March-15-2016 1:23 AM

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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