How to read tables in oracle database

There are four ways to view tables in an Oracle database: viewing the table structure and data through SQL statements, using the SQL Developer GUI, using the Toad GUI, and using command line tools.

How to view tables in an Oracle database

Oracle provides a variety of methods to view tables in a database. You can use the following steps to view the table structure and data:

View the table structure through SQL statements

• View the table structure: Use the following statement:

  SELECT * FROM dba_tables WHERE table_name = 'table_name';

• View table data: Use the following statement:

  SELECT * FROM table_name;

Through SQL Developer GUI

• Connect to the database.
• Expand the "Table" node in the object browser.
• Right-click the desired table and select Open.
• A window will open containing the structure and data of the table.

Connect to the database via the Toad GUI

• .
• Under the "Table" option, double-click the desired table.
• A window will open containing the structure and data of the table.

Other methods

• Using Data Dictionary: Data Dictionary provides information about tables, you can Use the following statement to query:

  SELECT * FROM user_tables WHERE table_name = 'table_name';

• Use command line tools: You can use SQL*Plus or SQLcl command line tools to view the table.

Example

To view the table named "employees":

• Use SQL statement:

  SELECT * FROM dba_tables WHERE table_name = 'employees';

• Using the SQL Developer GUI:

  • Expand the "Table" node.
  • Right-click the "employees" table and select "Open".

• Using the Toad GUI:

  • Under the "Tables" option, double-click the "employees" table.

The above is the detailed content of How to read tables in oracle database. For more information, please follow other related articles on the PHP Chinese website!