Query that ignore the spaces

Question

What\'s the best way to run a query so that spaces in the fields are ignored? For example, the following queries:

SELECT * FROM mytable WHERE username = \"Jo         


        

Answer 1

We often want to search for text, regardless of the number of spaces, white space and letters.

Just trim , lower case , and replace all multipe Non-word characters for one space.

SELECT regexp_replace(trim(lower('Here is              a            long               text               , with            many                 white spaces         AND             different                 character              sensitive')),'\W+',' ','g') t 

return :here is a long text with many white spaces and different character sensitive

Here is the use for search. Only the order of words is important, nothing more.And this is beautiful.

select * from (
SELECT regexp_replace(trim(lower('Here is              a            long               text               , with            many                 white spaces         AND             different                 character              sensitive')),'\W+',' ','g') t 
) as o
where t= regexp_replace(trim(lower('Here  is a LonG      TEXT , with            mANY white   ^    spaces         AND           different  character              sensiTive')),'\W+',' ','g')

return:here is a long text with many white spaces and different character sensitive

Garbage in data and junk in the query, but it still finds it right.