Work with LIKE operator

Hello

I have a little confusion in the safeguard clause.

create the products table (product_name varchar2 (100));

Start

insert into products (product_name) values('A%_WQ123');

insert into products (product_name) values('A%BWQ123');

insert into products (product_name) values('AB_WQ123');

commit;

end;
/

Select * from products where product_name like '\%_WQ12% %' escape '-';

output:

product_name

----------------

A % _WQ123

A % BWQ123

can you please tell how it works, in the above statement the ESCAPE escape only % or the two and_ %

Thank you

Hopefully, this will clear your query!

1.

Select * from products where product_name as '% \%_WQ12%' escape '-';
OP: -.
A % _WQ123
A % BWQ123

Here, you are escaping only '%' no '_ '.   And '_' sets a single character ('B' and '_') before the expression 'WQ12% ' and after '%' (escaped).

2.

Select * from products where product_name as '% \%\_WQ12%' escape '-';

OP-
A % _WQ123

Here, you are escaping both '%' and '_ '. It will review so these two characters as part of the expression '% WQ12 '. So like this template, there is only one record.

Thank you!

Tags: Database

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