sql 修改查詢結果的值給接下來的查詢用，但是不更改數據庫中的值

參考：

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

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

 

兩種方法

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關鍵字

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