SQL запрос на поиск дубликатов в столбце
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)SELECT
col,
COUNT(col)
FROM
table_name
GROUP BY col
HAVING COUNT(col) > 1;