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How to Get All Table And View Connection In Oracle?

2 minutes read

To get all table and view connections in Oracle, you can query the system views USER_TABLES and USER_VIEWS. You can retrieve the information about the tables and views along with their connections by querying these views using SQL queries. By joining these tables with other system views such as USER_CONS_COLUMNS and USER_CONSTRAINTS, you can get a comprehensive list of all connections between tables and views in your Oracle database. This information can be useful for understanding the relationships between different database objects and for analyzing the data model of your database.


How to get the foreign key constraints in Oracle?

To get the foreign key constraints in Oracle, you can run the following SQL query:

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SELECT
    constraint_name, 
    table_name, 
    column_name, 
    r_constraint_name, 
    r_table_name, 
    r_column_name
FROM
    all_cons_columns
WHERE
    constraint_name IN 
        (SELECT constraint_name 
         FROM all_constraints 
         WHERE constraint_type = 'R');


This query retrieves information about all foreign key constraints in the Oracle database, including the constraint name, the table and column in which it is defined, and the referenced table and column.


What is the USER_TAB_COLUMNS view in Oracle used for?

The USER_TAB_COLUMNS view in Oracle is used to display information about the columns of tables owned by the current user. This view contains columns such as table name, column name, data type, data length, precision, scale, and whether the column allows null values. It is commonly used by developers and database administrators to retrieve metadata about the columns of tables in the database.


How to get all foreign key constraints in Oracle?

You can query the USER_CONSTRAINTS view in Oracle to get all foreign key constraints in a database schema. Here is an example query:

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SELECT constraint_name, table_name, r_constraint_name, r_table_name
FROM user_constraints
WHERE constraint_type = 'R';


This query will return the names of the foreign key constraints, the tables they belong to, the names of the referenced constraints, and the tables they reference. You can modify the query as needed to filter and retrieve more specific information about foreign key constraints.


How to view the primary key of a table in Oracle?

To view the primary key of a table in Oracle, you can use the following query:

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SELECT constraint_name, column_name
FROM user_cons_columns
WHERE table_name = 'your_table_name_here';


Replace 'your_table_name_here' with the name of the table for which you want to view the primary key. This query will return the name of the constraint that defines the primary key, as well as the column(s) that make up the primary key.

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