oracle query table name

When using Oracle database, it is very important to understand how to query table names. Oracle database is a powerful relational database management system with many powerful query functions, and querying table names is no exception. In this article, you'll learn how to query table names using several different methods in Oracle Database.

1. Use the data dictionary to query table names

The data dictionary is an important part of the Oracle database. It saves the metadata information of the database, including table structure, indexes, users, etc. . We can use the data dictionary to quickly query table names.

Query all table names

You can use the following SQL statement to query all table names in the Oracle database:

SELECT table_name
FROM user_tables;

This query statement will return all table names under the current user. If you need to query the table names of other users, you can replace "user_tables" with "all_tables" or "dba_tables".

Query a specific table name

If you need to query a specific table name, you can use the following SQL statement:

SELECT table_name
FROM user_tables
WHERE table_name = 'table_name ';

Among them, "table_name" is the name of the table to be queried. If you want to query the table names of other users, you can replace "user_tables" with "all_tables" or "dba_tables".

This query statement can only query the table names under the current user or the table names under all users. It cannot directly query the table names under other users. If you want to query table names under other users, you need to grant this user table query permission first.

2. Use SQL Developer to query table names

Oracle SQL Developer is a free graphical tool that can help developers quickly develop and manage Oracle databases, including querying table names.

Query all table names

Open the Oracle SQL Developer tool, select the required connection, expand the connection, and then select the "Tables" tab to view all table names under the current user .

If you need to query the table names of other users, you can select the user's connection, and then open the "Tables" tab under the user in the same way.

Query a specific table name

In Oracle SQL Developer, you can also easily query a specific table name. Open the user connection you want to query, and then select the "Tables" tab under the user in the "Connections" column on the left.

Then, select the "Search" tab in the "Tables" window on the right, enter the name of the table to be queried in the "Search" window, and then click the "Search" button. The program will search for this table name in all tables under this user and list them in the Search Results window.

3. Use PL/SQL to query table names

If you want to write a script or program to automatically query table names, you can use PL/SQL language to complete it. PL/SQL is Oracle's programming language. It has powerful SQL query capabilities and can easily query table names.

Query all table names

The following is a PL/SQL script to query all table names under the current user:

DECLARE
cursor c IS SELECT table_name FROM user_tables;
BEGIN
FOR r IN c LOOP
dbms_output.put_line(r.table_name);
END LOOP;
END;

This script will traverse all the files under the current user table name and output it to the console.

Query a specific table name

The following is a PL/SQL script to query a specific table name:

DECLARE
v_table_name VARCHAR2(100) := 'table_name';
BEGIN
SELECT table_name INTO v_table_name
FROM user_tables
WHERE table_name = v_table_name;
dbms_output.put_line('Table Found: ' || v_table_name);
EXCEPTION
WHEN NO_DATA_FOUND THEN
dbms_output.put_line('Table Not Found: ' || v_table_name);
END;

This script will query whether there is a table named "table_name" under the current user. If so, then Print the table name; if not, print an error message.

Summary

In this article, we learned how to query table names using several different methods in Oracle Database. Use the data dictionary in Oracle Database to quickly query all table names or specific table names. Oracle SQL Developer provides a visual way to query table names. Finally, we can write a script or program using PL/SQL to automate querying table names. Hopefully these methods will help you better manage and query tables in your Oracle database.

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