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Window function application of sum and count

2022-08-11 02:47:00 【And line and Ann ~】

This chapter focuses on explaining the application of window functions for summing and counting.

The background of the topic is as follows:

There is an order information table (order_info), the brief description is as follows:

iduser_idproduct_namestatusclient_iddate
1557336C++no_completed12025-10-10
2230173543Pythoncompleted22025-10-12
357JScompleted32025-10-23
457C++completed32025-10-23
5557336Javacompleted12025-10-23
657Javacompleted12025-10-24
7557336C++completed12025-10-25
8557336Pythoncompleted12025-10-26
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