我的查询包含此信息
select accounts, associated from companies
结果:
Accounts: - Associated:
C10 - a1
C10 - a1
C10 - b1
C82 - a1
C82 - c3
B7 - a1
B7 - a1
R5 - c4
Q1 - a1
我喜欢写一个查询来计算每个帐户的关联总数,并得到这个结果(2个不同的列):
Accounts: - Number:
C10 - 2
C82 - 2
B7 - 1
R5 - 1
Q1 - 1
请帮忙吗?我确信我可以,但我不知道如何:S
新问题最初发布为答案:
表:
Accounts: - Associated:
C10 - a1
C10 - a1
C10 - b1
C82 - a1
C82 - c3
B7 - a1
B7 - a1
R5 - c4
Q1 - a1
我必须根据2列(相关联)进行计数才能获得此结果:
Accounts: - Number:
C10 - 2
C82 - 2
B7 - 1
R5 - 1
Q1 - 1
答案 0 :(得分:4)
您应该在GROUP BY
(或companyid
列的任何内容)上执行Accounts
,并使用COUNT()
汇总功能
SELECT companyid, count(*) AS Cnt
FROM companies
GROUP BY companyid
回答问题2:
SELECT companyid, COUNT(DISTINCT Associated) AS Cnt
FROM companies
GROUP BY companyid