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How to delete schema in sql developer?

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Database Schema

A schema is a logical database object holder. A database schema of a database system is its structure described in a formal language supported by the database management system. The formal definition of a database schema is a set of formulas (sentences) called integrity constraints imposed on a database. These integrity constraints ensure compatibility between parts of the schema. All constraints are expressible in the same language.
Creating schemas can be useful when objects have circular references, that is when we need to create two tables each with a foreign key referencing the other table. Different implementations treat schemas in slightly different ways.

Syntax:

Example-2: Create a schema that has an student details table. Give authority on the table to user DAVID.

SQL Code:

Create schema in MySQL [5.7]

In MySQL, CREATE SCHEMA is a synonym for CREATE DATABASE.

Syntax:

Create schema in Oracle 11g

Use the CREATE SCHEMA statement to create multiple tables and views and perform multiple grants in your own schema in a single transaction.
To execute a CREATE SCHEMA statement, Oracle Database executes each included statement. If all statements execute successfully, then the database commits the transaction. If any statement results in an error, then the database rolls back all the statements.

The CREATE SCHEMA statement can include CREATE TABLE, CREATE VIEW, and GRANT statements. To issue a CREATE SCHEMA statement, you must have the privileges necessary to issue the included statements.

Syntax:

Create schema in SQL Server 2014

Creates a schema in the current database. The CREATE SCHEMA transaction can also create tables and views within the new schema, and set GRANT, DENY, or REVOKE permissions on those objects.

Syntax:

The following statement creates a database and fully specifies each argument :

Alter Schema

The ALTER SCHEMA statement is used to rename a schema or to specify a new owner, the new owner must be a pre-existing user on the database

Syntax:

Parameter:

Name Description
schema_name The name of an existing schema.
new_schema_name The new name of the schema.
new_owner The new owner of the schema.

Alter Schema in MySQL [5.7]

In MySQL, CREATE SCHEMA is a synonym for CREATE DATABASE.

Syntax:

Alter schema in SQL Server 2014

ALTER SCHEMA can only be used to move securable between schemas in the same database. Users and schemas are completely separate.

Syntax:

Drop Schema

Destroy a schema.

Syntax:

Drop Schema in MySQL [5.7]

DROP DATABASE drops all tables in the database and deletes the database. DROP SCHEMA is a synonym for DROP DATABASE.

Syntax:

Drop schema in SQL Server 2014

Conditionally drops the schema only if it already exists.

Syntax:

Practice SQL Exercises

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