[英]How to count number of distinct pairs per partition in SQL?
I want to get the # of distinct pair combinations per level
in my table.我想在我的表中获得每个
level
的不同对组合的数量。
Sample Data:样本数据:
level group_no item_no
oiegown 1 1
oiegown 1 2
oiegown 1 2
oiegown 1 3
oiegown 2 1
wefwefw 1 1
wefwefw 2 2
My Attempt:我的尝试:
Wanted to do something like想做类似的事情
COUNT(DISTINCT group_no, item_no)
OVER (PARTITION BY level)
AS item_count
Expected Output:预期 Output:
level item_count
oiegown 4
wefwefw 2
But seems that COUNT()
only accepts one argument in BigQuery.但似乎
COUNT()
在 BigQuery 中只接受一个参数。 How can I modify my query to get my desired result?如何修改我的查询以获得我想要的结果?
You can join both column into one Text, and count the concatenated text您可以将两列合并为一个文本,并计算连接的文本
COUNT(DISTINCT CONCAT(group_no, item_no))
OVER (PARTITION BY level)
AS item_count
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