Her er en måde at gøre det på.
Da du også vil have de forskellige tæller, kan det gøres ved blot at gruppere rækkerne to gange. Den første GROUP BY vil fjerne dubletter, den anden GROUP BY vil producere det endelige resultat.
WITH
Sitings
AS
(
SELECT * FROM (VALUES
(1, 'Florida', 'Orlando', 'bird'),
(2, 'Florida', 'Orlando', 'dog'),
(3, 'Arizona', 'Phoenix', 'bird'),
(4, 'Arizona', 'Phoenix', 'dog'),
(5, 'Arizona', 'Phoenix', 'bird'),
(6, 'Arizona', 'Phoenix', 'bird'),
(7, 'Arizona', 'Phoenix', 'bird'),
(8, 'Arizona', 'Flagstaff', 'dog')
) F (ID, State, City, Siting)
)
,CTE_Animals
AS
(
SELECT
State, City, Siting
FROM Sitings
GROUP BY State, City, Siting
)
SELECT
State, City, COUNT(1) AS [# Of Sitings], STRING_AGG(Siting,',') AS Animals
FROM CTE_Animals
GROUP BY State, City
ORDER BY
State
,City
;
Resultat
+---------+-----------+--------------+----------+
| State | City | # Of Sitings | Animals |
+---------+-----------+--------------+----------+
| Arizona | Flagstaff | 1 | dog |
| Arizona | Phoenix | 2 | bird,dog |
| Florida | Orlando | 2 | bird,dog |
+---------+-----------+--------------+----------+
Hvis du stadig får en fejlmeddelelse om overskridelse af 8000 tegn, skal du caste værdierne til varchar(max) før STRING_AGG .
Noget lignende
STRING_AGG(CAST(Siting AS varchar(max)),',') AS Animals