SQL is a database language designed for the retrieval and management of data in a relational database. SQL is the standard language for database management. SQL programming language uses various commands for different operations. Why Use SQL? What is Data Manipulation Language? What is DCL?
PL/SQL - Basic Syntax
DDL Triggers - Oracle PL/SQL Programming, 5th Edition [Book]
However, one of its attractions is the ease with which it can be extended using powerful scripting languages such as Perl and Python. I chose to use Python as a language extension for PostgreSQL because I have some familiarity with it and quite like it. The following example was created in PostgreSQL 9. Having created a database using the old Oracle scott schema containing two small tables called emp and dept, I created the Python language extension by executing this command as the postgres superuser:. Assuming this step runs successfully, a python function can now be created. If the above works, then try Python by opening the Python shell and from there, type the following:.
Subscribe to RSS
Create an Oracle table called suppliers that stores supplier ID, name, and address information. Create an Oracle table called customers that stores customer ID, name, and address information. But this time, the customer ID should be the primary key for the table. Based on the departments table below, create an Oracle table called employees that stores employee number, employee name, department, and salary information.
Data Definition Language helps you to define the database structure or schema. DDL commands help you to create the structure of the database and the other database objects. Its commands are auto-committed so, the changes are saved in the database permanently.