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Triggers in PL – SQL Free SQL Tutorials and Online Training

Triggers are a series of PL/SQL statements attached to a  database table that executes whenever a triggering event (select, update, insert, delete) occurs. Unlike stored procedures and functions, they not explicitly called, but they are activated when a triggering event occurs. A trigger is nothing but a PL/SQL code executed automatically in response to a […]

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Inter-Thread Communication in Java – Part 1 : Free Java Tutorials

Inter-Thread Communication encompasses those Java concepts and features using which threads can communicate with each other. This communication helps to reduce the unnecessary waiting time of threads. Thus, it helps to improve overall performance. Two threads can communicate with each other by using wait(), notify() and notifyAll() methods. The thread which is expecting updation is […]

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Introduction to Joins in SQL – Free SQL Tutorials

Joins are useful in querying data from two or more tables. Joins are used to fetch the data from two tables based on some specific condition.There are following types of Joins: Equijoin Non-equijoin Outer join Self join Syntax for Join:

  Here, where clause is the condition on which tables are joined. Here table1, […]

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Inter-Thread Communication in Java – Part 2 : Free Java Tutorials

Inter-Thread Communication encompasses those Java concepts and features using which threads can communicate with each other. This communication helps to reduce the unnecessary waiting time of threads. Thus, it helps to improve overall performance. Two threads can communicate with each other by using wait(), notify() and notifyAll() methods. In this tutorial, we will see an […]

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Models In Django-Free Django Tutorials

Objects in Django In object-oriented programming there is a concept called object.The idea behind object is that instead of writing everything as a sequence programming instructions,we can model things and can also define how they interact with each other. So object is a collection of actions and properties.Let’s understand it by example. Suppose if we […]