MySQL sort by number of occurrences

Below query can give you the no.of occurrences of string appears in both columns i.e text and subject and will sort results by the criteria but this will not be a good solution performance wise its better to sort the results in your application code level

SELECT *,
(LENGTH(`Text`) - LENGTH(REPLACE(`Text`, 'Keyword', ''))) / LENGTH('Keyword')
+
(LENGTH(`Subject`) - LENGTH(REPLACE(`Subject`, 'Keyword', ''))) / LENGTH('Keyword') `occurences`
 FROM 
`Table`
 WHERE (Text LIKE '%Keyword%' OR Subject LIKE '%Keyword%')
ORDER BY `occurences`  DESC

Fiddle Demo

Suggested by @lserni a more cleaner way of calculation of occurrences

SELECT *,
(LENGTH(`Text`) - LENGTH(REPLACE(`Text`, 'test', ''))) / LENGTH('test') `appears_in_text`,

(LENGTH(`Subject`) - LENGTH(REPLACE(`Subject`, 'test', ''))) / LENGTH('test') `appears_in_subject`,

(LENGTH(CONCAT(`Text`,' ',`Subject`)) - LENGTH(REPLACE(CONCAT(`Text`,' ',`Subject`), 'test', ''))) / LENGTH('test') `occurences`
 FROM 
`Table1`
 WHERE (TEXT LIKE '%test%' OR SUBJECT LIKE '%test%')
ORDER BY `occurences`  DESC

Fiddle Demo 2

You want SUM instead. Count will count how many records have non-null values, which means ALL matches and NON-matches will be counted.

SELECT *, SUM(Text LIKE '%Keyword') AS total_matches
...
ORDER BY total_matches

SUM() will count up how many boolean true results the LIKE produces, which will be typecast to integers, so you get a result like 1+1+1+0+1 = 4, instead of the 5 non-nulls count.