Question

I want to search a column and get values where value containts \ .

I tried select * from "Values" where "ValueName" like '\'. But returns no value.

Also tried like "\" and like'\''%' etc. But no results.

Answer 1

See the DB2 Documentation on the LIKE predicate, in particular the parts about escape expressions.

What you want is

select * from Values where ValueName like '\\%' escape '\'

To give an example of usage:

create table backslash_escape_test
(
backslash_escape_test_column varchar(20)
);

insert into backslash_escape_test(backslash_escape_test_column) 
values ('foo\');
insert into backslash_escape_test(backslash_escape_test_column) 
values ('no slashes here');
insert into backslash_escape_test(backslash_escape_test_column) 
values ('foo\bar');
insert into backslash_escape_test(backslash_escape_test_column)
values ('\bar');

select count(*) from backslash_escape_test where 
backslash_escape_test_column like '%\\%' escape '\';

returns 3 (all 3 rows with \ in them).

select count(*) from backslash_escape_test where 
backslash_escape_test_column like '\\%' escape '\';

returns 1 (the \bar row).