apache

The DROP TABLE statement is used to remove an existing table including all its triggers, constraints, permissions. Syntax Following is the Syntax of the DROP TABLE statement.ij> DROP TABLE table_name;…

The CREATE TABLE statement is used for creating a new table in Derby database. Syntax Following is the syntax of the CREATE statement. CREATE TABLE table_name ( column_name1 column_data_type1 constraint…

Data Type is an attribute that specifies the type of data of any object. Each column, variable and expression has a related data type. You can use these data types…

This chapter gives you the syntax of all the Apache Derby SQL statements. All the statements start with any of the keywords like SELECT, INSERT, UPDATE, DELETE, ALTER, DROP, CREATE,…

Apache Derby provides you tools such as sysinfo, ij and, dblook. sysinfo tool Using this tool, you can get information about Java and Derby environment. Browse through the bin folder of Derby installation…

Following chapter explains how to download and install Apache Derby. Downloading Apache Derby Visit the home page of Apache Derby home page https://db.apache.org/derby/. Click the Download tab. Select and click on…

You can deploy apache derby in two modes, namely embedded mode and server mode. Embedded mode You can run derby in embedded mode using Java application (using embedded driver). If…

Apache Derby is a Relational Database Management System which is fully based on (written/implemented in) Java programming language. It is an open source database developed by Apache Software Foundation. Audience This tutorial is prepared…

We can grant and revoke permissions to users in HBase. There are three commands for security purpose: grant, revoke, and user_permission. grant The grant command grants specific rights such as read, write,…

count You can count the number of rows of a table using the count command. Its syntax is as follows: count ‘<table name>’ After deleting the first row, emp table will have…