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This tutorial discusses how to check for duplicates in a MySQL table and retrieve the number of duplicates using the SELECT DISTINCT and statements, respectively. SELECT COUNT SELECT DISTINCT Check for duplicates in a MySQL table using The...

Traditional SQL INSERT statements do not perform input validation of their parameters/values ​​against existing database tables, which sometimes results in errors when duplicate keys are found during the insert process. This is handled...

This tutorial aims to understand unsigned in MySQL. unsigned Using keywords in MySQL Businesses and organizations have to assign data type as unsigned for certain columns. However, it is important to understand when and where to use this da...

Summary: in this tutorial, we will learn how to shuffle or sort the values ​​or records of a table in MySQL. Most businesses and organizations that use MySQL for data analysis or visualization need to sort different table values ​​o...

In this tutorial article, we will explain how to declare variables in SQL code for MySQL database. In SQL scripts, you can use variables to store values ​​and use them in place of literals during the execution of a series of commands. U...