如何在 MySQL 中将字符串添加到列值之前?
我需要一个 SQL 更新语句来更新所有行的特定字段，并在现有值的前面添加一个字符串test".
I need a SQL update statement for updating a particular field of all the rows with a string "test" to be added in the front of the existing value.
例如，如果现有值是try"，它应该变成testtry".
For example, if the existing value is "try" it should become "testtry".
推荐答案
您可以使用 CONCAT 函数来做到这一点:
You can use the CONCAT function to do that:
UPDATE tbl SET col=CONCAT('test',col);
如果您想变得更聪明并且只更新尚未预先设置测试的列，请尝试
If you want to get cleverer and only update columns which don't already have test prepended, try
UPDATE tbl SET col=CONCAT('test',col)
WHERE col NOT LIKE 'test%';
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