Tag: SQL
After creating a foreign key, you may need to drop the foreign key from the table. You can do this with the ALTER TABLE operator in Oracle/PLSQL. Syntax to drop a foreign key in Oracle /...
You will learn how to use foreign keys with cascade delete in Oracle PLSQL with syntax and examples. What are foreign keys with cascade delete? Foreign keys with cascade delete means that if a...
Foreign Keys is a way to ensure data integrity in your Oracle database. A Foreign Keys means that values in one table must also appear in another table.The reference table is called the...
In Oracle PLSQL primary key is a single field or a combination of fields that determines the uniqueness of the record. Fields that are part of the primary key cannot contain the value NULL. A...
This article will show you how to create new databases and tables using SQL commands in a mysql client. It is assumed that this tool is running and connected to the MySQL database...
This is the function MySQL GROUP CONCAT and how it can change the work with query results. Especially if the database is the data source for the application. Database I will use the Sakila...
The CREATE SCHEMA operator does not actually create the circuit in Oracle. (Learn how to create a schema in Oracle.)The CREATE SCHEMA statement is only used to create objects (i.e. tables,...
Oracle Role is a set or group of privileges that can be granted to users or other roles. It is a great way for database administrators to save time and effort. Create Oracle Role The role is...
You can grant and revoke privileges for different database objects in Oracle. We will first look at how to grant and remove table privileges, and then how to grant and remove privileges to...
Set a default persistent table space First, make sure you create a permanent table space.Then you will need to modify the Oracle database to use the persistent table space as the default...
To find the default permanent tablespace in Oracle, you can run the following SELECT operator. Default persistent tablespace SELECT PROPERTY_VALUE FROM DATABASE_PROPERTIES WHERE PROPERTY_NAME...
The DROP TABLESPACE operator is used to remove tabular space from the Oracle database. TABLESPACE is used to allocate space in the Oracle database where schema objects are stored. Syntax for the...
The ALTER TABLESPACE operator is used to change the table space or one of its data files or temporary files. TABLESPACE is used to allocate space in an Oracle database where schema objects are...
The CREATE TABLESPACE operator is used to allocate space in the Oracle database where schema objects are stored. The CREATE TABLESPACE operator can be used to create three types of tabular...
Relational databases are among the most frequently used databases to date, and therefore SQL skills are mandatory for most positions.In this article with SQL interview questions I will...
You can find users created in Oracle by performing a command line query. User information is stored in various system tables - ALL_USERS and DBA_USERS, depending on what user information you want...