🐬 MySQL Functions (Beginner → Interview Level) MySQL provides built-in functions to perform calculations, string handling, date operations, and data analysis directly inside SQL queries. 1️⃣ What are MySQL Functions? MySQL functions are predefined...
MySQL Functions MySQL provides a wide range of built-in functions that allow you to perform operations on data directly in SQL queries.Functions are categorized into String, Numeric, Date/Time, Aggregate, and Control Flow functions. 1....
MySQL Data Types In MySQL, data types define the kind of data a column can store. Choosing the correct data type is crucial for data integrity, storage efficiency, and query performance. MySQL data types...
👁️ MySQL Views – Complete Tutorial A View in MySQL is a virtual table based on the result of an SQL query.It does not store data physically; it stores only the query definition. 👉...
MySQL Working with Dates Working with dates and time is a very important topic in MySQL, frequently asked in exams, interviews, and real projects like billing systems, attendance, logs, and reports. MySQL 1️⃣ Date...
🔢 MySQL AUTO_INCREMENT Field The AUTO_INCREMENT field in MySQL is used to automatically generate unique numbers for a column, usually for primary keys. 👉 Most commonly used for ID columns. 1️⃣ What is AUTO_INCREMENT?...
📇 MySQL CREATE INDEX Statement – Complete Tutorial (Beginner → Interview Level) The CREATE INDEX statement in MySQL is used to create indexes on table columns to speed up data retrieval. 👉 Indexes make...
⚙️ MySQL DEFAULT Constraint The DEFAULT constraint in MySQL is used to assign a default value to a column when no value is provided during INSERT. 👉 It helps maintain data consistency and reduces...
✅ MySQL CHECK Constraint The CHECK constraint in MySQL is used to limit the values that can be inserted into a column by applying a condition. 👉 It ensures data validity and integrity at...
🔗 MySQL FOREIGN KEY Constraint The FOREIGN KEY constraint in MySQL is used to maintain referential integrity between two tables by creating a parent–child relationship. 👉 It ensures that data in one table matches...