SQL Query Where Column = '' returning Emoji characters

Question

Ok so I have a table with three columns:

Id, Key, Value

I would like to delete all rows where Value is empty (\'\'

Answer 1

Google send me here looking for a way filter all rows with an emoji on a varchar column. In case that your looking for something similar:

SELECT mycolumn
FROM mytable
WHERE REGEXP_EXTRACT(mycolumn,'\x{1f600}')  <> ''

the \x{1f600} is the char code for the searched emoji, you can find the emoji codes here

Answer 2

It's not an answer to your "why", but in terms of your overall goal, perhaps you should alter your strategy for searching for empty values:

Select * from [Imaging.ImageTag] where LEN([Value]) = 0

As per the comments (thanks Martin Smith for providing some copy/pastable emoji):

SELECT CASE WHEN N'' = N'                                                                    

                                                        
            

Answer 3

This is collation dependant.

Matches empty string

SELECT 1 where N'' = N'                                                                    

                                                        
            

Answer 4

Complementing this answers When you need use 'like' at sql

WHERE
N'' + COLUMNS like N'%'+ @WordSearch +'%' COLLATE latin1_general_100_ci_as