How do I fix: Method 2: Using the concat() function?

Step 1: Replace CONCAT with the MySQL-specific concat() function (e.g., `UPDATE table SET data = concat(data, 'a')`). This will achieve the same result as using CONCAT but is more explicit and easier to read.

Coding⏱️ 2 min read📅 2026-06-02

How to Fix: SQL UPDATE all values in a field with appended string CONCAT not working

Q: How do I fix: 🚀 How to Resolve This IssueMethod 1: Using the CONCAT function with an empty string?

Step 1: Replace 'a' in your query with an empty string '' (e.g., `UPDATE table SET data = CONCAT(data, '')`). This will ensure that the function appends a new character to the end of each string.

Fix SQL UPDATE all values in a field with appended str. Use the CONCAT function with the || oper. Step-by-step guide included.

Quick Answer: Use the CONCAT function with the || operator instead, like this: UPDATE table SET data = CONCAT(data, 'a')

📋 Table of Contents

💡 Why You Are Getting This Error
🚀 How to Resolve This Issue
🎯 Final Words

The issue you're facing is due to the way MySQL handles string concatenation. When using the CONCAT function, it doesn't automatically append a new character to the end of the string if there are no arguments provided. Instead, it returns NULL if all arguments are NULL.

💡 Why You Are Getting This Error

The CONCAT function in MySQL doesn't append a new character to the end of the string if all arguments are NULL.

🚀 How to Resolve This Issue

Method 1: Using the CONCAT function with an empty string

Step 1: Replace 'a' in your query with an empty string '' (e.g., `UPDATE table SET data = CONCAT(data, '')`). This will ensure that the function appends a new character to the end of each string.

Method 2: Using the concat() function

Step 1: Replace CONCAT with the MySQL-specific concat() function (e.g., `UPDATE table SET data = concat(data, 'a')`). This will achieve the same result as using CONCAT but is more explicit and easier to read.

🎯 Final Words

To avoid this issue in the future, make sure to provide a non-empty string when using CONCAT or concat(). Additionally, consider using MySQL-specific functions and syntax for better readability and maintainability.

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