Shulou(Shulou.com)06/01 Report--

Today is the first day of 2019, I would like to wish you all a happy New year, dreams are still on the way, let us continue to cheer!

According to the previous plan, finish this record today, so as to record your growth.

1. Syntax and usage of several ranking functions:

Rank () over ([partition by col] order by col)

Dense_rank () over ([partition by col] order by col)

Rownumber () over ([partition by col] order by col)

Rank () is a function of ranking. The function group will be sorted with a jump mark, and those with the same score will be juxtaposed.

Dense_rank () this function does not jump, the same score is tied for the first, the next is the second.

Row_number () can sort within a group (if there is a partition by) after sorting by a field through over.

The following picture shows the test results. Let's take a look at the picture and digest it:

Here is the code:

With lcy as (select regexp_substr ('10, 20, 30, 30, 50, 60, 80, 90, 100) score from dual connect by level

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