How it works AS an operator?

Values of JOHN and KEITH have spaces in the string.
create table string_test ( test_str varchar2(15));
insert into string_test values ('JO HN');
insert into string_test values ('JOHN');
insert into string_test values ('RAM');
insert into string_test values ('KEITH ');

SQL> select * from string_test;

TEST_STR
---------------
JO HN
JOHN
RAM
KEITH
RTO, I found the query to find all values of string that has whitespace in it.
select * from string_test where test_str like '%' || chr(32) || '%';
But I don't understand how it works. The percent ('%') apostrophes sign will not be considered a literal?

GarryB wrote:
Values of JOHN and KEITH have spaces in the string.

create table string_test ( test_str varchar2(15));
insert into string_test values ('JO HN');
insert into string_test values ('JOHN');
insert into string_test values ('RAM');
insert into string_test values ('KEITH ');

SQL> select * from string_test;

TEST_STR
---------------
JO HN
JOHN
RAM
KEITH

RTO, I found the query to find all values of string that has whitespace in it.

select * from string_test where test_str like '%' || chr(32) || '%';

But I don't understand how it works. The percent ('%') apostrophes sign will not be considered a literal?

No, because the sign '%' has a special meaning for the LIKE operator. This is a wildcard, which means that any character.

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