Mysql> INSERT INTO customers(first_name, last_name, phone) VALUES ('MARY', 'SMITH', '222222') mysql> INSERT INTO customers(first_name, last_name, phone) VALUES ('JOHN', 'DOE', '111111') Run the INSERT commands one by one to populate the table.
As earlier indicated, you might be importing some records from an external data source that lacks the functionalities of a relational database.
Please note that it is possible for you to INSERT details of the same customer multiple times in this table. Next, populate the customers table with some records. mysql> CREATE TABLE customers (Ĭustomer_id BIGINT NOT NULL AUTO_INCREMENT PRIMARY KEY, The table will then record the first_name, last_name and phone number of the customer.Ĭreate the customers table. In this table, you'll uniquely identify the customers by referring to the customer_id column, which should be auto-populated since you'll define it with a PRIMARY KEY statement. Then, run the command below to create a test_db database.
#Delete duplicate rows in sql password#
When prompted, enter the root password of your MySQL server and press ENTER to continue.
#Delete duplicate rows in sql install#
To test this guide, you only need to install the MySQL database server.įirst, SSH to your server and run the command below to log in to your MySQL database server as root. To follow along with this guide, make sure you have the following:Ī LAMP Stack. Finally, you'll use the MySQL GROUP BY and HAVING clauses to find and DROP duplicate rows. You'll then populate the table with a random list of customers' details containing some duplicates. In this guide, you'll create a test_db database and a sample customers table.
To overcome this challenge, you must delete the duplicate customers' records from your database. For instance, if customers get registered multiple times in your invoicing software, this might complicate the process of allocating credit limits. Having identical copies of the same record may negatively affect your application and business logic. This usually happens after importing data from external sources such as spreadsheet applications that don't have the features of relational databases. Sometimes, you might see more than one copy of the same record appearing in a MySQL database table.
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