Let's say you have table like following. You want to query the nums of each level.
Let's say you have a table like following.
We can use left join in Hive to implements in or not in operation. Now we have two tables A and B like following.
I push my project to remote but I forget add .gitignore file. I use these commands to delete remote file(.idea and target).
A java developer like programing and writing. Hope my blog can help you.
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