连接并在 where 子句中使用 oracle plsql

Question

I have to concatenate two fields and use concatenated field in where clause but it gives me invalid identifier. How to solve this query.

select i.FIRST_NAME || ' - ' || i.LAST_NAME as NAME, i.* from CONTACT i 
where NAME = 'JOHN - HANKS'

This gives me

ORA-00904: "NAME": invalid identifier
00904. 00000 -  "%s: invalid identifier"

Answer 1

You cannot use a column alias at the same level. Just use a subquery (or repeat the expression):

select c.*
from (select i.FIRST_NAME || ' - ' || i.LAST_NAME as NAME, i.*
      from CONTACT i 
     ) c
where c.NAME = 'JOHN - HANKS';

Answer 2

The WITH clause is also a good alternative, better readability. Also, if the subquery is to be used multiple times, it is even better.

WITH data as(
   select i.FIRST_NAME || ' - ' || i.LAST_NAME as NAME, i.* from CONTACT i)
select  * from data where name = 'JOHN - HANKS';

Answer 3

select i.FIRST_NAME || ' - ' || i.LAST_NAME as NAME, i.* from CONTACT i where i.first_name ||'~'||i.last_name = 'JHON~HANKS';