Find Primary Key in Oracle: Quick Guide

One way to view the primary key of a table in Oracle is by using the following method:

1. Type the DESC command to view the table structure. Enter the following command in the SQL command line:
2. Show the structure of the table named “table_name”.
3. Replace table_name with the name of the table you want to view. This will display the structure of the table, including primary key information.
4. Utilize the ALL_CONSTRAINTS view to query the primary key. Input the following command in the SQL command line:
5. Retrieve the name and type of constraints for a specific table that are primary keys.
6. Replace table_name with the name of the table you want to view. This will return the primary key constraint name and type of the table.
7. Use the USER_CONS_COLUMNS view to query the primary key column. Enter the following command in SQL Command Line:
8. Retrieve the column name from the USER_CONS_COLUMNS table where the table name is ‘table_name’ and the constraint name is ‘constraint_name’.
9. Replace table_name with the name of the table you want to view, and replace constraint_name with the name of the primary key constraint you want to view. This will return the column names involved in the primary key constraint.

The first method is the simplest and most commonly used way, as it allows direct access to the structure information of the table, including the primary key. The other two methods involve retrieving primary key information by querying system views, which offer more flexibility and detail but require a certain level of understanding of the system views.