如何在MySQL中将字符串添加到列值之前? [英] How to prepend a string to a column value in MySQL?

问题描述

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，如果现有值为"try"，则应变为"testtry".

For example, if the existing value is "try" it should become "testtry".

推荐答案

您可以使用

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进行测试的列，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%';

这篇关于如何在MySQL中将字符串添加到列值之前?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！