我想知道如何使用变量:
SELECT Count(distinct UserIP)
FROM VisitorIP
G0
SELECT Country, Count(distinct UserIP) Visitors, Count(distinct UserIP) * 100 / 2865 Pct
FROM VisitorIP group by country order by Visitors desc
现在我想用上面的计数(不同的UserIP)替换2865。
有一种说法:在IT中,比10个人更了解的人更好!
任何线索欢迎...... 祝所有极客们新年快乐。
答案 0 :(得分:3)
使用变量:
DECLARE @userip_count int
SELECT @userip_count = Count(distinct UserIP)
FROM VisitorIP
SELECT Country, Count(distinct UserIP) Visitors, Count(distinct UserIP) * 100 / @userip_count Pct
FROM VisitorIP group by country order by Visitors desc
GO
此处移动GO
至关重要,以便变量保留在第二个查询中使用的范围内。
答案 1 :(得分:0)
SELECT Country,
Count(distinct UserIP) Visitors,
round(Count(distinct UserIP) /
(SELECT Count(distinct UserIP)
FROM VisitorIP) * 100,2) Pct
FROM VisitorIP
group by country
order by Visitors desc