Sql statement does not give require output

Question

Hi Guys,
i have created two tables, tables data and required output are given below: any help would be highly appretiated:
{code}
create table tt (keyword varchar2(250))
insert into tt ('Smith')
insert into tt ('Walker')
create table a (name_a varchar2(250), name_b varchar2(250))
insert into a ('Smith Walker','Walker Smith');
insert into a ('Adam Webster','Steve David');
insert into a ('SmiGavin Walker'  ,'James Smith');
insert into a ('Trever Michael ','Andy Walker');
insert into a ('James Walton' ','Smith Thomas');
select * from a, tt b where instr(a.name_a, b.keyword)=0 and instr(a.name_b,b.keyword)>0
Trever Michael Andy Walker Walker
Gavin Walker James Smith Smith
James Walton Smith Thomas Smith
Required output
I want output where all name_a column should not have keyword, on the other hand, all name_b should have keyword
Trever Michael Andy Walker Walker
James Walton Smith Thomas Smith
*************"Gavin Walker James Smith Smith" this one should not come as it has Walker in NAme_a which is forbidden, please can anyone help how to fix this issue.
{/code}
Best Regards,
Zaid

Answer 1

Try this
SELECT KEYWORD, NAME_A, NAME_B FROM TT, A
WHERE INSTR (NAME_A, KEYWORD) =0 AND INSTR (NAME_B, KEYWORD)>0
AND NAME_A NOT IN (SELECT NAME_A FROM TT, A
WHERE INSTR (NAME_A, KEYWORD) >0)