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Operators and Clauses
  • 2026-02-08

MySQL BETWEEN Date Range: Usage, Pitfalls, and Performance Optimization

1. Introduction The BETWEEN operator in MySQL is a convenient feature that allows you to retrieve data within a specific date range using a simple query. For example, it is useful when retrieving mont […]

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Server Management
  • 2026-02-08

MySQL Locking Explained: Check Lock Status, Release Locks Safely, and Prevent Deadlocks (5.6–8.0)

1. Introduction MySQL is widely used as a database management system, but when multiple queries attempt to access the same data, a locking mechanism is triggered. Locks are essential for maintaining d […]

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Functions
  • 2026-02-08

MySQL COUNT(DISTINCT) Explained: How to Count Unique Values Efficiently

1. Introduction When managing a database, you may encounter situations such as, “How many different countries have been registered?” or “How many unique email addresses are there?”In such cases, you c […]

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Functions
  • 2026-02-08

MySQL Current Timestamp: NOW(), CURRENT_TIMESTAMP, SYSDATE(), UTC, and Best Practices

1. The shortest SQL to get the current date/time in MySQL If you want to get the current date/time in MySQL, the first functions to remember are NOW() and CURRENT_TIMESTAMP. Below are the shortest SQL […]

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Functions
  • 2026-02-08

MySQL IFNULL Function Guide: Replace NULL Values (Oracle NVL Alternative)

1. Introduction When working with databases, handling NULL values is a critical point.In particular, it’s not uncommon for people who are used to Oracle’s NVL function to realize that NVL is not avail […]

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Basic Operations
  • 2026-02-08

MySQL Commands Guide: Beginner to Intermediate Basics, CRUD, Users, Backup & Troubleshooting

1. Introduction MySQL is a widely used open-source relational database among database management systems (DBMS). It is especially popular for web applications and enterprise systems. In this article, […]

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Functions
  • 2026-02-08

MySQL Current Time Guide: NOW(), CURRENT_TIMESTAMP, DATE_FORMAT, Time Zone Settings & Best Practices

1. Introduction When Do You Need to Handle the Current Time in MySQL? In MySQL, retrieving the current time is required in many different scenarios. For example, the following use cases are common: As […]

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Functions
  • 2026-02-08

MySQL Current Timestamp: How to Get the Current Date and Time (NOW, SYSDATE, UTC_TIMESTAMP)

1. Introduction Getting the current time in MySQL is a crucial part of database management.For example, you may need to retrieve the current time in situations like the following: As you can see, prop […]

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Backup and Restore
  • 2026-02-08

How to Restore a MySQL Database (Complete Guide: mysqldump, GUI Tools, and Binary Logs)

1. Introduction What Is a MySQL Restore? A MySQL restore is the process of recovering backed-up data into the original database.By performing a restore, you can recover data after data loss or system […]

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Server Management
  • 2026-02-08

MySQL Character Set Change Guide: Convert to utf8mb4 (Fix Mojibake)

1. Introduction Why You May Need to Change the MySQL Character Set A database character set is an important setting that determines how text data is encoded and processed for storage. In MySQL, the de […]

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