Oracle Database Applications Tutorial252

Oracle Database is a powerful software that can be used to store, manage, and retrieve data. It is a relational database management system (RDBMS), which means that it organizes data into tables, rows, and columns. Oracle Database is used by businesses of all sizes to manage their data, and it is also a popular choice for developing web applications.
This tutorial will provide you with a basic overview of Oracle Database and how to use it to create and manage databases. We will cover the following topics:
* Creating a database
* Adding tables to a database
* Inserting data into tables
* Selecting data from tables
* Updating data in tables
* Deleting data from tables

Creating a DatabaseThe first step to using Oracle Database is to create a database. A database is a collection of related tables, and it is the basic unit of data storage in Oracle Database. To create a database, use the `CREATE DATABASE` statement. The following statement creates a database named `my_database`:
```
CREATE DATABASE my_database;
```

Adding Tables to a DatabaseOnce you have created a database, you can start adding tables to it. A table is a collection of related data, and it is the basic unit of data storage in Oracle Database. To create a table, use the `CREATE TABLE` statement. The following statement creates a table named `my_table` with three columns: `id`, `name`, and `age`:
```
CREATE TABLE my_table (
id NUMBER PRIMARY KEY,
name VARCHAR2(255),
age NUMBER
);
```

Inserting Data into TablesOnce you have created a table, you can start inserting data into it. To insert data into a table, use the `INSERT` statement. The following statement inserts a row of data into the `my_table` table:
```
INSERT INTO my_table (id, name, age) VALUES (1, 'John', 30);
```

Selecting Data from TablesTo select data from a table, use the `SELECT` statement. The following statement selects all of the rows from the `my_table` table:
```
SELECT * FROM my_table;
```

Updating Data in TablesTo update data in a table, use the `UPDATE` statement. The following statement updates the `age` column for the row with the `id` of 1:
```
UPDATE my_table SET age = 31 WHERE id = 1;
```

Deleting Data from TablesTo delete data from a table, use the `DELETE` statement. The following statement deletes the row with the `id` of 1 from the `my_table` table:
```
DELETE FROM my_table WHERE id = 1;
```

ConclusionThis tutorial has provided you with a basic overview of Oracle Database and how to use it to create and manage databases. For more information, refer to the Oracle Database documentation.

2024-11-13

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