Question

Is it possible to let mysql give me all rows that have equal entries in one column, regardless how they look?

For now I use some lines of code but I would like to let mysql do the job!

Answer 1

This should return what you need, I think. The question is very vague.

-- Depending on your SQL syntax, this might work:

SELECT COUNT(*), colname FROM TABLE 
GROUP BY colname HAVING COUNT(*) > 1

-- or similarly,

SELECT FIELD, COUNT(FIELD) AS NumOccurrences 
FROM TABLE GROUP BY FIELD HAVING ( COUNT(FIELD) > 1 )

-- or if trying to find a duplicate combination 
-- of multiple columns,

SELECT column1, column2, column3, COUNT(column3) 
FROM TABLE GROUP BY column1, column2, column3 
HAVING COUNT(column3) > 1

‘Found at http://psoug.org/snippet/mySQL-Find-all-duplicates-in-a-column_353.htm‘