Oracle Database Tutorial67

IntroductionOracle Database is a relational database management system (RDBMS) developed by Oracle Corporation. It is one of the most popular RDBMSs in the world, used by businesses and organizations of all sizes. Oracle Database is known for its reliability, scalability, and performance.

Getting StartedTo get started with Oracle Database, you will need to download and install the software. You can download Oracle Database from the Oracle website. Once you have installed Oracle Database, you can create a new database using the following command:```
CREATE DATABASE my_database;
```
You can then connect to your new database using the following command:```
CONNECT my_database;
```

Once you are connected to your database, you can start creating tables, inserting data, and running queries.

Creating TablesTo create a table, you can use the following syntax:```
CREATE TABLE table_name (
column_name data_type,
column_name data_type,
...
);
```
For example, to create a table called "employees" with three columns ("id", "name", and "salary"), you would use the following command:```
CREATE TABLE employees (
id NUMBER,
name VARCHAR2(255),
salary NUMBER
);
```

Inserting DataTo insert data into a table, you can use the following syntax:```
INSERT INTO table_name (column_name, column_name, ...)
VALUES (value, value, ...);
```
For example, to insert the following data into the "employees" table:```
id | name | salary
1 | John Doe | 10000
2 | Jane Smith | 20000
3 | John Brown | 30000
```
You would use the following command:```
INSERT INTO employees (id, name, salary)
VALUES (1, 'John Doe', 10000),
(2, 'Jane Smith', 20000),
(3, 'John Brown', 30000);
```

Running QueriesTo run a query on a table, you can use the following syntax:```
SELECT column_name, column_name, ...
FROM table_name
WHERE condition;
```
For example, to select the "name" and "salary" columns from the "employees" table for all employees with a salary greater than 20000, you would use the following command:```
SELECT name, salary
FROM employees
WHERE salary > 20000;
```

ConclusionThis is just a brief overview of Oracle Database. For more information, please refer to the Oracle documentation.

2024-12-03

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