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        如何在 MySQL 中将字符串添加到列值之前?

        How to prepend a string to a column value in MySQL?(如何在 MySQL 中将字符串添加到列值之前?)
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                  本文介绍了如何在 MySQL 中将字符串添加到列值之前?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着跟版网的小编来一起学习吧!

                  问题描述

                  限时送ChatGPT账号..

                  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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