Oracle Database Tutorial for Beginners41

IntroductionOracle Database is a powerful and widely used relational database management system (RDBMS). It is known for its scalability, reliability, and performance. In this tutorial, we will provide an introduction to Oracle Database, covering the basics of creating and managing databases, tables, and data.

Creating a DatabaseTo create a database, you can use the following command:```
CREATE DATABASE database_name;
```

For example, to create a database named "mydb", you can use:```
CREATE DATABASE mydb;
```

Creating TablesTables are used to store data in a database. To create a table, you can use the following command:```
CREATE TABLE table_name (
column_name data_type,
column_name data_type,
...
);
```

For example, to create a table named "employees" with columns for "id", "name", and "salary", you can use:```
CREATE TABLE employees (
id NUMBER,
name VARCHAR2(255),
salary NUMBER
);
```

Inserting DataTo insert data into a table, you can use the following command:```
INSERT INTO table_name (column_list) VALUES (value_list);
```

For example, to insert a record into the "employees" table, you can use:```
INSERT INTO employees (id, name, salary) VALUES (1, 'John Doe', 10000);
```

Selecting DataTo select data from a table, you can use the following command:```
SELECT column_list FROM table_name WHERE condition;
```

For example, to select all records from the "employees" table, you can use:```
SELECT * FROM employees;
```

Updating DataTo update data in a table, you can use the following command:```
UPDATE table_name SET column_name = new_value WHERE condition;
```

For example, to update the salary of the employee with id 1 to 11000, you can use:```
UPDATE employees SET salary = 11000 WHERE id = 1;
```

Deleting DataTo delete data from a table, you can use the following command:```
DELETE FROM table_name WHERE condition;
```

For example, to delete the employee with id 1, you can use:```
DELETE FROM employees WHERE id = 1;
```

ConclusionThis tutorial provides a basic introduction to Oracle Database. It covers the basics of creating and managing databases, tables, and data. For more advanced topics, such as data modeling, performance tuning, and security, please refer to the official Oracle documentation.

2024-12-01

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