show all tables in oracle with code examples

Oracle is a popular relational database management system known for its scalability, security, and reliability. It is widely used by enterprises of all sizes to handle data management and analysis requirements. As a database administrator or developer, you might find yourself in a situation where you need to know the list of all tables in an Oracle database, either for system maintenance or application development purposes. In this article, we will discuss how to show all tables in Oracle using some simple code examples.

There are several ways to show all tables in Oracle. The most popular methods are using the SQL Developer tool, querying the data dictionary views, and using SQL statements. Let's take a look at each of these methods in detail.

Method 1: Using the SQL Developer Tool

SQL Developer is a free graphical tool provided by Oracle for database development and management. It includes a built-in database browser that makes it easy to show all tables in an Oracle database.

To show all tables in Oracle using SQL Developer, follow the steps below:

Step 1: Open SQL Developer and connect to the target database.
Step 2: Expand the Connections panel, and then expand the database connection.
Step 3: Right-click on the Tables node, and then select "Filter" from the context menu.
Step 4: In the filter dialog box, clear any existing filters, and then click "OK."
Step 5: The Tables panel will now display a list of all tables in the database.

Method 2: Querying the Data Dictionary Views

Oracle stores information about the database objects in a set of system tables known as the data dictionary. These tables can be queried to get information about the tables in the database.

To show all tables in Oracle using data dictionary views, follow the steps below:

Step 1: Open the SQL*Plus command-line interface or any other Oracle client tool that supports SQL statements.
Step 2: Connect to the target database using valid credentials.
Step 3: Run the following SQL statement to get a list of all tables in the current schema:

SELECT table_name FROM user_tables;

This statement will return a list of all tables in the user's schema.

Alternatively, you can run the following statement to get a list of all tables in the entire database:

SELECT owner, table_name FROM all_tables;

This statement will return a list of all tables in all schemas in the database.

Method 3: Using SQL Statements

You can also use SQL statements to show all tables in Oracle. You need to have valid credentials and access to the database to execute the SQL statements.

To show all tables in Oracle using SQL statements, follow the steps below:

Step 1: Open the SQL*Plus command-line interface or any other Oracle client tool that supports SQL statements.
Step 2: Connect to the target database using valid credentials.
Step 3: Run the following SQL statement to get a list of all tables in the database:

SELECT table_name FROM dba_tables;

This statement will return a list of all tables in the entire database.

Alternatively, you can run the following statement to get a list of all tables in a specific schema:

SELECT table_name FROM all_tables WHERE owner = 'schema_owner';

This statement will return a list of all tables in the specified schema.

Conclusion

In this article, we discussed different methods to show all tables in Oracle. We looked at how to use the SQL Developer tool, querying the data dictionary views, and using SQL statements. Each of these methods has its own advantages and disadvantages, and the choice depends on the specific use case. As a database administrator or developer, it's essential to know how to show all tables in Oracle to perform effective database management and application development.

let's dive a little deeper into each of the previous topics.

Method 1: Using the SQL Developer Tool

SQL Developer is a powerful graphical tool that allows you to manage and develop your Oracle databases with ease. It has a built-in database browser that you can use to show all the tables in a database quickly. The tool is free to download and use, and it's available for Windows, Linux, and macOS.

In addition to showing the tables, SQL Developer also allows you to view and edit the table's data, create and modify database objects, and run SQL queries against the database. You can also use the tool to monitor the database performance, manage users and roles, and generate reports.

SQL Developer is an excellent tool for developers and database administrators who need a comprehensive and intuitive tool to manage their Oracle databases. It's user-friendly and easy to use, and it provides all the features you need to manage your databases effectively.

Method 2: Querying the Data Dictionary Views

The data dictionary views contain metadata about the database objects such as tables, columns, indexes, and views. You can use these views to query the database and extract information about the tables in the database.

The views are organized in a hierarchical structure, and they contain information about the system, user, and application objects. The views are read-only, and they are updated automatically by the Oracle database whenever you create, modify, or delete a database object.

Querying the data dictionary views is a powerful way to get information about the database objects and manage the database. However, you need to be careful when querying the views as there are many narrow and complex views, and it's easy to run into performance issues.

Method 3: Using SQL Statements

SQL is a versatile database language that allows you to perform a wide range of operations on the database. You can use SQL statements to create and modify database objects, insert and update data, and extract information about the database objects.

SQL statements are a powerful way to interact with the database, and they are used by many programming languages and frameworks to connect to the database and manage the data. As an Oracle developer or administrator, you need to be familiar with SQL statements and know how to use them effectively.

SQL statements are very flexible, and you can use them to extract information about the database objects quickly. You can also use them to join tables, filter data, and perform complex aggregate functions. However, you need to be careful when writing SQL statements to avoid syntax errors and performance issues.

Conclusion

In summary, showing all the tables in an Oracle database is a simple yet essential task for database administrators and developers. There are various methods to achieve this, including using SQL Developer, querying the data dictionary views, and using SQL statements. Each method has its advantages and disadvantages, and the choice depends on your specific needs and requirements.

As an Oracle developer or administrator, it's essential to have a good understanding of the different methods available and know how to use them effectively. This will help you manage your database more efficiently and develop better applications.

Popular questions

Q1. What is the Oracle database?

A1. Oracle database is a relational database management system that allows you to store, manage and retrieve data efficiently and securely. It's used by a wide range of organizations from small businesses to large enterprises.

Q2. How can you show all tables in an Oracle database using SQL statements?

A2. You can show all tables in an Oracle database using the following SQL statement:

SELECT table_name FROM dba_tables;

This statement will return a list of all tables in the database.

Q3. What is the data dictionary in an Oracle database?

A3. The data dictionary is a set of tables and views that contain information about the database objects, such as tables, columns, and indexes. You can use these tables and views to query the database and extract information about the objects in the database.

Q4. What is the advantage of using SQL Developer to show all tables in an Oracle database?

A4. SQL Developer is a graphical tool that provides a user-friendly interface to show all the tables in a database. It's easy to use and doesn't require any SQL knowledge. Additionally, you can use SQL Developer to view and edit the table data, create and modify database objects, and run SQL queries against the database.

Q5. What is the difference between user_tables and all_tables in Oracle?

A5. The user_tables view contains information about the tables owned by the current user, while the all_tables view contains information about all the tables in the database that the user has access to. The dba_tables view contains information about all the tables in the database, regardless of the owner or access privileges.

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As a seasoned software engineer, I bring over 7 years of experience in designing, developing, and supporting Payment Technology, Enterprise Cloud applications, and Web technologies. My versatile skill set allows me to adapt quickly to new technologies and environments, ensuring that I meet client requirements with efficiency and precision. I am passionate about leveraging technology to create a positive impact on the world around us. I believe in exploring and implementing innovative solutions that can enhance user experiences and simplify complex systems. In my previous roles, I have gained expertise in various areas of software development, including application design, coding, testing, and deployment. I am skilled in various programming languages such as Java, Python, and JavaScript and have experience working with various databases such as MySQL, MongoDB, and Oracle.
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