如何計算表中的相似條目？

Question

我有一個表，其中包含以下數據

companyid    subscriptionid
1            21
1            23
2            89
4            99
4            101

我想計算每個唯一公司出現的次數，如何使用t-sql做到這一點？

因此，例如，我想查看1 = 2次...但是我不介意它是否在表中不需要打印數據...。

Answer 1

SELECT companyid, COUNT(*) AS CompanyCount
    FROM YourTable
    GROUP BY companyid

Answer 2

SELECT t.CompanyId, COUNT(1)
FROM schema.table AS t
GROUP BY t.CompanyId

Answer 3

SELECT companyid, count(companyid) as TotalEntries
FROM YourTable
GROUP BY companyid