Oracle checks which tables are in the database

There are four ways to query tables in Oracle database: Using SQL query: Use SELECT * FROM

syntax. Using JDBC: Use Statement and ResultSet objects. Using PL/SQL: Use CURSOR and FOR loops. Use Oracle tools: such as SQL*Plus, Toad, and Data Modeler.

How to query the tables in the Oracle database

To query the tables in the Oracle database, you can use the following method:

1. Query using SQL

This is the most common method of querying tables in Oracle database. Use the following syntax:

<code class="sql">SELECT * FROM <table_name></code>

For example, to query all records in the customers table, you can use the following query:

<code class="sql">SELECT * FROM customers</code>

2. Using JDBC

JDBC (Java Database Connectivity) is an API that allows Java programs to interact with databases. Query the table using the following code:

<code class="java">Statement stmt = connection.createStatement();
ResultSet rs = stmt.executeQuery("SELECT * FROM customers");</code>

3. Using PL/SQL

PL/SQL is Oracle's procedural language. Use the following code to query the table:

<code class="plsql">DECLARE
  CURSOR c_customers IS
    SELECT * FROM customers;
BEGIN
  FOR r IN c_customers LOOP
    DBMS_OUTPUT.PUT_LINE(r.customer_id);
  END LOOP;
END;</code>

4. Using Oracle tools

Oracle provides a variety of tools to query the table, including:

• SQL*Plus: Interactive SQL query tool
• Toad: Third-party database management tool
• Data Modeler: Tools for designing and managing database models

Which method you choose depends on your specific needs and preferences.

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