如何在 MySQL 中將字串新增至列值之前？

Prepending a String to Column Values in MySQL

Problem:

You aim to modify a specific column in all rows of a MySQL table by adding a string ("test") to the beginning of the existing value. For instance, "try" would change to "testtry."

Solution:

Utilize the CONCAT function in an SQL update statement to achieve this:

UPDATE tbl SET col=CONCAT('test',col);

Advanced Update:

If you wish to selectively update only columns that do not already contain the "test" prefix, you can employ the following statement:

UPDATE tbl SET col=CONCAT('test',col)
WHERE col NOT LIKE 'test%';

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