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Ever heard about the term Schema? Well, a schema in SQL is a collection of database objects linked with a particular database username. The username that I am talking about is called the Schema owner, or more appropriately the owner of the related group of objects. Let us dig this topic a bit deeper and discuss it in detail!
The agenda for this tutorial is as follows:
As you all might be aware of the term SQL, stands for the Structured Query Language. SQL is an ASI standard language but there are many different versions of this language. SQL is the standard language for Relational Database System. It helps you in accessing and manipulating databases. Several queries against the database can be executed. The data from a database can be retrieved. You can insert, update, delete records in a database. It helps in creating new databases. New tables and views can also be created.
Let us move further to the next segment.
A Schema in SQL is a collection of database objects associated with a database. The username of a database is called a Schema owner (owner of logically grouped structures of data). Schema always belong to a single database whereas a database can have single or multiple schemas. Also, it is also very similar to separate namespaces or containers, which stores database objects. It includes various database objects including your tables, views, procedures, index, etc.
Let’s move ahead and look at some of the advantages of using Schema in SQL.
These were few advantages, now the next topic is the method to create a schema.
CREATE SCHEMA [schema_name] [AUTHORIZATION owner_name] [DEFAULT CHARACTER SET char_set_name] [PATH schema_name[, ...]] [ ANSI CREATE statements [...] ] [ ANSI GRANT statements [...] ];
You can create a schema using SQL server management studio. Follow the mentioned steps!
Follow the steps in order to create a schema.
This is how a schema is created. Now let us see how a schema is altered.
The schema in a database can be altered by using the alter schema statement. This statement is specifically used to rename a schema. The new owner must be a pre-existing user.
ALTER SCHEMA schema_name [RENAME TO new_schema_name] [ OWNER TO new_user_name]
new name of the schema
new owner of the schema
In order to drop schema we use the following syntax:
DROP SCHEMA <schema name>
If you have to drop the entire database follow the mentioned syntax:
DROP DATABASE databasename;
This was all about Schema in SQL. I hope that the content explains the above-added value to your knowledge. Keep reading, keep exploring!
With this, we come to an end to this article. I hope you understood how to use the various constraints present in the database. If you wish to learn more about MySQL and get to know this open-source relational database, then check out our MySQL DBA Certification Training which comes with instructor-led live training and real-life project experience. This training will help you understand MySQL in-depth and help you achieve mastery over the subject.
Got a question for us? Please mention it in the comments section of this article on SQL Constraints and I will get back to you.