使用 TERADATA 中的单个函数获取反转值

Question

Can you guys help me go through this:

Input: 
First_Name    Last_Name
John          Smith
Smith         John

Output:
Customer_Name
John Smith
John Smith

So basically, what I want here is to get the Customer Name as sometimes the First & Last name are inverted in the database and I would like to do it in TERADATA using just a function (of possible of course) without using UNION/UNION ALL for example.

Answer 1

You can do a little alphabetical comparison between the two columns and take the min and the max in any case Example:

select 'John' as a ,'Smith' as b ,case when a > b then a else b end Less_
    ,case when a <= b then a else b end More_

Regards,