如何在MySQL中根据其当前值更新字段? [英] How to update a field based on its current value in MySQL?
本文介绍了如何在MySQL中根据其当前值更新字段?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小编来一起学习吧!
问题描述
是否可以获取字段的当前值,将其用作计算中的变量,然后根据结果更新字段?
Is it possible to get the current value of a field, use it as a variable in a calculation, then update the field based on the result?
例如,表1中ID为"1"的记录的值为"2"
For example the record with the ID "1" in table1 has a value of "2"
SELECT table1
WHERE ID = "1"
SET RESULT to CurrentID
RESULT = CurrentID + 1;
推荐答案
对于任何具有ID
等于"1"的列:
This will set the result
column to the value of the CurrentID
column (plus 1) of the same row, for any row that has an ID
column that equals "1":
UPDATE table1
SET result = CurrentID + 1
WHERE ID = "1"
这篇关于如何在MySQL中根据其当前值更新字段?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!
查看全文