rank function in oracle sql

Label: first of all, to understand rank in English means: rank. That is, it is a function that determines the level of the data. Take sales as an example, there are regions, years, months, salespeople, sales, records of these five fields. We can sort salespeople by region, year, month, sales, which is the equivalent of a level concept for salespeople, the first

SQL SERVER ranking function RANK, DENSE_RANK, NTILE, ROW_NUMBERPrefaceThis document describes how to use instance data to help you understand SQL SERVER ranking functions RANK, DENSE_RANK, NTILE, and ROW_NUMBER.PreparationsCreate a test table: create table test(id int ident

Demand:Find out how many top50 each vendor sells in each type of product Analysis:1. Query, GROUP by the specified field (vendor, product type), take the first 50 rows of each group, and view the number of each vendor2. Use the Rank function to rank the sales of each vendor, each type of product, and add a fake ran3. Filter the rows with the ran less than or equa

RANK () over ([ Partition_by_clause divides the result set generated by the FROM clause into the partition that is applied to the RANK function. NBSP; Order_by_clause determines the order in which the rank values are applied to rows in the partition. The following is an example of a score Table table schema S_sc

5495 paint-blue 4 35 1496 Paint-yellow 4 2493 paint-red 4 3492 paint-black 4 14 4494 Paint-silver 4 5 (s) affected)B. Ranking all rows in the result setThe following example returns the top 10 employees by salary. because the PARTITION by clause is not specified, the RANK

identity_insert [dbo]. [Student] off/****** Object:default [df__departmen__depna__5441852a] Script date:05/11/2015 23:16:23 ******/ALTER TABLE [dbo]. [Department] ADD DEFAULT (") for [depname]go/****** Object:default [df__score__category__5ebf139d] Script date:05/11/2015 23:16 : ******/alter TABLE [dbo]. [Score] ADD DEFAULT (") for [category]go/****** Object: Default [Df__score__score__5fb337d6] Script date:05/11/2015 23:16:23 ******/alter TABLE [dbo]. [Score] ADD DEFAULT ((0)) for [score]go/**

Label:1.row_number () is the line number2.rank: Similar to Row_number, except that it processes the order by field, and if the field value is the same, the line number remains unchanged3.dense_rank: Similar to rank, the difference is whether the row number retains a position, and rank retains the position, that is, the row's value is changed from 1 to 3, because

row_number ()Row_number () is used sequentially, equivalent to the rownum value in our normal query.In fact, from the above three examples, it is not difficult to see over the (partition by ...) The overall concept that I understand isPartition by: The field partition of the finger, if not, for the entire dataORDER BY: Continuous operation in the specified field (such as Sum, sort (rank (), etc.), if not specified, is equivalent to the whole sum oper

analytic function in Oracle that is used to partition the result set. It differs from the aggregate function group by that it simply places the original data in a ranking, can return more than one record in a group (the number of records is unchanged), and group by is the aggregation of the original data statistics, generally only one reflects the results of sta

= Maxsal;Four, Rank function(1) Each department is sorted by salary:Select Empno,deptno,sal,Rank (partition by Deptno ORDER by Sal) rank,Dense_rank () over (partition by Deptno ORDER by Sal) Denserank,Row_number () over (partition by Deptno ORDER by Sal) Row_numberfrom EMP;NULLS first/last Usage:Sql> SELECT * from emp

source data. The first step is to deal with it simply. CREATE TABLE STU1 as Select S.stuname sname,s.subjectname| | S.subjectscore Sshow from student s --Select *from stu1 As shown below: OK, you can write the statement below. Select Sname as name, Allstr detailed description from(Select Sname,allstr,Row_number () over (partition by sname ORDER BY sname,curr_level Desc) Ename_path_rankFrom (Select Sname,sshow,rank,level as Curr_level,LTrim (Sys_conn

similar, more powerful (can be sorted from 1 in each group), because the Row_number () is the analysis function and rownum is pseudo column so row_number () must over and rownum can not over. RANK ():The Rank function returns a unique value, except when the same data is encountered, where all the same data is ranked

Rank () Use description: A. Introduction to Functions: Returns the rank of the value of the specified field within the result set partition, and the value of the specified field is ranked before the related row plus one. B. Grammar: RANK () over ([ C. Parameter Description: Partition_by_clause The result set that is generated from the FROM clause into the partit

A Data grouping report was created several days ago and then re-ordered. It is written in crystal script. First, set a global variable to auto-add it, And then clear it in each group head. The code is very simple and I will not post it.After a short time, a colleague sought a grouping and then re-ordered the statement. He thought that my report was made using a similar SQL statement. In fact, if Oracle is u

The Oracle analysis functions RANK (), ROW_NUMBER (), and LAG () can be used. For more information, see. The Oracle analysis functions RANK (), ROW_NUMBER (), and LAG () can be used. For more information, see. ROW_NUMBER () OVER (partition by COL1 order by COL2) Indicates grouping by COL1 and sorting by COL2 within t

Tags: permanent related information. com size des number partition records the largestExcerpt from: http://www.linuxidc.com/Linux/2015-04/116349.htm The difference between rank () over, Dense_rank (), Row_number () in Oracle Suppose there is a student table student, the student table has a name, a score, a course number, and now I need to sort the students ' grades according to the course. SELECT * FROM Stu

Php implements the rank function in excel, excelrank. Php implements the rank function in excel. excelrank describes how php implements the rank function in excel. Share it with you for your reference. The specific analysis is as