SQL - Grouping COUNT Results

Question

The query I'm trying to answer is 'How many sales above or equal to 60 has each person made?'

My table (sales$):

SaleID  name    salevalue
1   Steve   100
2   John    50
3   Ellen   25
4   Steve   100
5   Mary    60
6   Mary    80
7   John    70
8   Mary    55
9   Steve   65
10  Ellen   120
11  Ellen   30
12  Ellen   40
13  John    40
14  Mary    60
15  Steve   50

My code is:

select name,
COUNT(*) as 'sales above 60'
from Sales$
group by salevalue, name
having salevalue >= 60;

Which gives:

Ellen   1
John    1
Mary    2
Mary    1
Steve   1
Steve   2

The information is correct in that Mary & Steve both have 3 sales, however I'm forced by the HAVING command to group them out.

Any ideas? I'm sure I've just taken a wrong turning.

Answer 1

You can use conditional aggregation for this:

select name,
       COUNT(case when salevalue >= 60 then 1 end) as 'sales above 60'
from Sales$
group by name

This way COUNT will take into consideration only records having salevalue >= 60.

Answer 2

我已将HAVING语句换成WHERE并取得了预期的结果：

select name, count(*) 'sales above 50' from sales$ where salevalue >=60 group by name

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