Zapytanie SQL, aby znaleźć duplikaty w kolumnie
SELECT name, COUNT(email)
FROM users
GROUP BY email
HAVING COUNT(email) > 1
Unusual Unicorn
SELECT name, COUNT(email)
FROM users
GROUP BY email
HAVING COUNT(email) > 1SELECT [CaseNumber], COUNT(*) AS Occurrences
FROM [CaseCountry]
GROUP BY [CaseNumber]
HAVING (COUNT(*) > 1)Multiple field=
SELECT username, email, COUNT(*)
FROM users
GROUP BY username, email
HAVING COUNT(*) > 1
Single field=
SELECT _column, COUNT(*)
FROM _table
GROUP BY _column
HAVING COUNT(*) > 1select barcode, name, count(*)
from product
group by barcode, name
HAVING count(*) > 1