Database

An Overview of Triggers in MySQL with Example

A trigger is a set of commands invoked automatically when an SQL statement changes data on the associated table. Other stored SQL types in MySQL are events, stored procedures, and stored functions.

Basic SQL Concepts - WHERE CLAUSE

The WHERE clause lets you add further conditions on your query. We will see the use of WHERE clauses along with other clauses that will help us refine our queries in this section.

Basic SQL DDL Commands

DDL stands for Data Definition Language, and these queries are used to create or manipulate the structure of the database and schemas. Here we will see basic DDL queries that you will use in general. Please feel free to add more through the comments section.

Basic SQL Concepts

First we will look at some commonly asked questions based on the contents of this page. You can refer to getting-started-with-oracle-xe-and-jdbc-hands-On for setting up oracle xe and database for examples here: create 2 tables employee and emp, with 2 columns empName and id; and insert data with ids ranging from 1 to 5. You might have to use some common sense for some of the examples, like deleting/modifying duplicate data.

Important JDBC Core API Classes, Interfaces and Exceptions

The JDBC API is comprised of two Java packages: java.sql and javax.sql. The following are core JDBC classes, interfaces, and exceptions in the java.sql package:

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