在SQL中将名称拆分为姓，名，中间名

Question

I have a record below. I want to split the name into Lname, Fname, Mname

Name
John, David Handsome

Here is my query. I was able to get Lname but not Fname and Mname yet.

SELECT 
NAME, 
LEFT(NAME,CHARINDEX(',',NAME)-1)    AS LNAME
FROM TABLE

My desired output would be:

Name                    Lname   Fname   Mname
John, David Handsome    John    Daivd   Handsome

Answer 1

如果名称格式将保持不变，则使用以下格式：

select name,LEFT(NAME,CHARINDEX(',',NAME)-1)    AS LNAME, regexp_substr(name,'[^ ]+',1,2)  as fname,regexp_substr(name,'[^ ]+',1,3) mname from table;

Answer 2

You can do it like this;

SELECT 
LEFT(NAME,CHARINDEX(',',NAME)-1) AS LNAME,
LEFT(REPLACE(NAME,LEFT(NAME,CHARINDEX(',',NAME)+1),''),CHARINDEX(' ',REPLACE(NAME,LEFT(NAME,CHARINDEX(',',NAME)+1),''))-1) AS FNAME,
REPLACE(REPLACE(NAME,LEFT(NAME,CHARINDEX(',',NAME)+1),''),LEFT(REPLACE(NAME,LEFT(NAME,CHARINDEX(',',NAME)+1),''),CHARINDEX(' ',REPLACE(NAME,LEFT(NAME,CHARINDEX(',',NAME)+1),''))-1),'') AS MNAME

It comes little confusing because of nested replace and charindex functions. But if you focus on them closely, logic is quite simple.