sql 修改查询结果的值给接下来的查询用，但是不更改数据库中的值

参考：

https://blog.csdn.net/qq_30815327/article/details/79714551

https://blog.csdn.net/jiwenyi163/article/details/2794038

 

两种方法

方案一

case when

SELECT * FROM test;

 a
---
 1
 2
 3


SELECT a,
       CASE WHEN a=1 THEN 'one'
	    WHEN a=2 THEN 'two'
	    ELSE 'other'
       END
    FROM test;

 a | case
---+-------
 1 | one
 2 | two
 3 | other

 

 

方案二

replace关键字

SELECT * FROM table_name 

Name	Age	Phone
ahuang	18	13222100000
ahong	19	13222100001
azi stripes	22	13222100002

SELECT name,age,replace(phone,'1322','1380'） FROM table_name 

Name	Age	Phone
ahuang	18	13802100000
ahong	19	13802100001
azi stripes	22	13802100002