How to view table structure in SQL window

The method to view the table structure in the SQL window is as follows: Open the SQL window and run the DESCRIBE statement (for MySQL and MariaDB) and run the \d command (for PostgreSQL) so that the table's field name, data type, constraints, default values, comments and other information can be displayed.

How to view table structure in SQL window

Viewing the table structure in an SQL window is very simple, with just a few steps:

1. Open the SQL window

• Open a SQL window in a database management system such as MySQL Workbench or PostgreSQL.

2. Run the DESCRIBE statement

• Type the following statement where table_name is the table name of its structure you want to check:

 <code class="sql">DESCRIBE table_name;</code>

3. Run the \d command (for PostgreSQL)

• If you are using PostgreSQL, you can also use the \d command to view the table structure:

 <code class="sql">\d table_name;</code>

Results explanation:

After executing the above statement, the SQL window displays a table with the following information about the table structure:

• Field name
• Data Type
• Constraints (such as primary key, foreign key, non-null)
• default value
• Comments (if present)

Example:

For example, if you want to view a table structure called Customers , you can run the following statement:

 <code class="sql">DESCRIBE Customers;</code>

The output will be similar to the following:

<code> -------- --------- ------ ----- --------- ------- | Field | Type | Null | Key | Default | Extra | -------- --------- ------ ----- --------- ------- | id | int(11) | NO | PRI | NULL | auto_increment | | name | varchar(255) | NO | | NULL | | | email | varchar(255) | YES | | NULL | | | phone | varchar(255) | YES | | NULL | | | address | varchar(255) | NO | | NULL | | -------- --------- ------ ----- --------- -------</code>

This tells us that Customers table has the following structure:

• The field id is a primary key, of type int(11) , is not allowed to be empty, and is automatically incremented.
• The field name is a non-empty varchar(255) string.
• The field email is an empty varchar(255) string.
• The field phone is an nullable varchar(255) string.
• The field address is a non-empty varchar(255) string.

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