Souy Soeng

How To Delete Duplicate Rows in MySQL Duplicate rows in a table can cause data inconsistencies and affect the integrity of your database. Deleting du…

MySQL ROW_NUMBER Function The ROW_NUMBER() function in MySQL is a window function introduced in MySQL 8.0 . It assigns a unique sequential integer t…

MySQL CUME_DIST Function The CUME_DIST() function in MySQL is a window function introduced in MySQL 8.0 . It calculates the cumulative distribution …

MySQL FIRST_VALUE Function The FIRST_VALUE() function in MySQL is a window function introduced in MySQL 8.0 . It returns the first value in an order…

MySQL ROUND Function The ROUND() function in MySQL is used to round a numeric value to a specified number of decimal places. It can round both posit…

MySQL LAG Function The LAG() function in MySQL is a window function introduced in MySQL 8.0 . It allows you to access data from a previous row in th…

MySQL LEAD Function The LEAD() function in MySQL is a window function introduced in MySQL 8.0 . It allows you to access data from a subsequent row i…

MySQL NTH_VALUE Function The NTH_VALUE() function in MySQL is a window function introduced in MySQL 8.0 . It allows you to retrieve the nth value fr…

MySQL PERCENT_RANK Function The PERCENT_RANK() function in MySQL is a window function introduced in MySQL 8.0 . It calculates the relative rank of a…

Emulating MySQL ROW_NUMBER Function MySQL versions before 8.0 did not directly support the window function. However, starting with MySQL 8.0 , the RO…

MySQL String Length Functions In MySQL, there are two primary functions used to get the length of a string: CHAR_LENGTH() (or LENGTH() ) LENGTH() (…

MySQL LAST_VALUE Function The LAST_VALUE() function in MySQL is a window function that returns the last value in an ordered set of values. It is use…

MySQL CURDATE Function The CURDATE() function in MySQL is used to return the current date. It does not return the time component, only the date in Y…

MySQL AVG Function The AVG() function in MySQL is an aggregate function that returns the average value of a numeric column. It is typically used for…

MySQL COUNT Function The COUNT() function in MySQL is an aggregate function used to return the number of rows that match a specified condition. It i…

MySQL CAST Function The CAST() function in MySQL is used to convert a value from one data type to another. It is part of the SQL standard, making it…

MySQL GROUP_CONCAT() Function The GROUP_CONCAT() function in MySQL concatenates values from a group into a single string. It is a powerful tool for …

MySQL Aggregate Functions MySQL provides several aggregate functions that perform calculations on a set of values and return a single summarized res…

MySQL WEEKDAY Function The WEEKDAY() function in MySQL is used to determine the weekday index of a given date. The index starts at 0 for Monday an…

MySQL Control Flow Functions and Expressions Control flow functions and expressions in MySQL are used to add logic and conditions to SQL queries. The…

MySQL Standard Deviation Functions In MySQL, standard deviation functions are used to calculate the amount of variation or dispersion in a set of val…

MySQL CREATE DATABASE The CREATE DATABASE statement in MySQL is used to create a new database. Databases in MySQL are used to store, organize, and m…

Understanding MySQL Storage Engines MySQL storage engines are the components responsible for managing how data is stored, retrieved, and written in M…

MySQL Sequence In MySQL, a sequence refers to a series of unique numbers generated in a defined order. Unlike databases like Oracle or PostgreSQL th…

MySQL TRUNCATE TABLE The TRUNCATE TABLE statement in MySQL is used to quickly and completely delete all rows from a table. Unlike the DELETE statem…

MySQL Temporary Table A Temporary Table in MySQL is a special type of table that exists only during the session in which it is created. Temporary ta…

MySQL DROP DATABASE The DROP DATABASE statement is used in MySQL to delete an entire database, including all its tables, data, and associated object…

Managing Databases in MySQL In MySQL, managing databases involves creating, modifying, dropping, and interacting with databases efficiently. Below is…

Managing Databases in MySQL In MySQL, managing databases is a fundamental task, and it includes creating, deleting, selecting, modifying, and maintai…

Selecting a MySQL Database Using the USE Statement The USE statement in MySQL is used to select a database to work with. Once a database is selecte…