Ms sql server row_number rowid starts by

Asked by Izabella Cobb on
Tags: server
7 Answers

Answer by Phoebe Heath

The ROW_NUMBER() is a window function that assigns a sequential integer to each row within the partition of a result set. The row number starts with 1 for the first row in each partition.,In this tutorial, you have learned how to use the SQL Server ROW_NUMBER() function to assign a sequential integer to each row within a partition of a query.,First, the CTE used the ROW_NUMBER() function to assign every row in the result set a sequential integer.,Summary: in this tutorial, you will learn how to use the SQL Server ROW_NUMBER() function to assign a sequential integer to each row of a result set.

The following shows the syntax of the ROW_NUMBER() function:

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}ROW_NUMBER() OVER (
    [PARTITION BY partition_expression, ... ]
    ORDER BY sort_expression [ASC | DESC], ...
)
Code language: SQL (Structured Query Language) (sql)

The following statement uses the ROW_NUMBER() to assign each customer row a sequential number:

SELECT 
   ROW_NUMBER() OVER (
	ORDER BY first_name
   ) row_num,
   first_name, 
   last_name, 
   city
FROM 
   sales.customers;Code language: SQL (Structured Query Language) (sql)

The following example uses the ROW_NUMBER() function to assign a sequential integer to each customer. It resets the number when the city changes:

SELECT 
   first_name, 
   last_name, 
   city,
   ROW_NUMBER() OVER (
      PARTITION BY city
      ORDER BY first_name
   ) row_num
FROM 
   sales.customers
ORDER BY 
   city;Code language: SQL (Structured Query Language) (sql)

The following example uses the ROW_NUMBER() to return customers from row 11 to 20, which is the second page:

WITH cte_customers AS (
    SELECT 
        ROW_NUMBER() OVER(
             ORDER BY 
                first_name, 
                last_name
        ) row_num, 
        customer_id, 
        first_name, 
        last_name
     FROM 
        sales.customers
) SELECT 
    customer_id, 
    first_name, 
    last_name
FROM 
    cte_customers
WHERE 
    row_num > 20 AND 
    row_num <= 30;
Code language: SQL (Structured Query Language) (sql)

Source: https://www.sqlservertutorial.net/sql-server-window-functions/sql-server-row_number-function/


Answer by Jada Wilcox

Numbers the output of a result set. More specifically, returns the sequential number of a row within a partition of a result set, starting at 1 for the first row in each partition.,There is no guarantee that the rows returned by a query using ROW_NUMBER() will be ordered exactly the same with each execution unless the following conditions are true.,The following example calculates a row number for the salespeople in Adventure Works Cycles based on their year-to-date sales ranking.,order_by_clause The ORDER BY clause determines the sequence in which the rows are assigned their unique ROW_NUMBER within a specified partition. It is required. For more information, see OVER Clause (Transact-SQL).

Syntax

ROW_NUMBER ( )   
    OVER ( [ PARTITION BY value_expression , ... [ n ] ] order_by_clause )  

The following query returns the four system tables in alphabetic order.

SELECT 
  name, recovery_model_desc
FROM sys.databases 
WHERE database_id < 5
ORDER BY name ASC;

To add a row number column in front of each row, add a column with the ROW_NUMBER function, in this case named Row#. You must move the ORDER BY clause up to the OVER clause.

SELECT 
  ROW_NUMBER() OVER(ORDER BY name ASC) AS Row#,
  name, recovery_model_desc
FROM sys.databases 
WHERE database_id < 5;

Adding a PARTITION BY clause on the recovery_model_desc column, will restart the numbering when the recovery_model_desc value changes.

SELECT 
  ROW_NUMBER() OVER(PARTITION BY recovery_model_desc ORDER BY name ASC) 
    AS Row#,
  name, recovery_model_desc
FROM sys.databases WHERE database_id < 5;

The following example calculates a row number for the salespeople in Adventure Works Cycles based on their year-to-date sales ranking.

USE AdventureWorks2012;   
GO  
SELECT ROW_NUMBER() OVER(ORDER BY SalesYTD DESC) AS Row,   
    FirstName, LastName, ROUND(SalesYTD,2,1) AS "Sales YTD"   
FROM Sales.vSalesPerson  
WHERE TerritoryName IS NOT NULL AND SalesYTD <> 0;  

Here is the result set.

  
Row FirstName    LastName               SalesYTD  
--- -----------  ---------------------- -----------------  
1   Linda        Mitchell               4251368.54  
2   Jae          Pak                    4116871.22  
3   Michael      Blythe                 3763178.17  
4   Jillian      Carson                 3189418.36  
5   Ranjit       Varkey Chudukatil      3121616.32  
6   José         Saraiva                2604540.71  
7   Shu          Ito                    2458535.61  
8   Tsvi         Reiter                 2315185.61  
9   Rachel       Valdez                 1827066.71  
10  Tete         Mensa-Annan            1576562.19  
11  David        Campbell               1573012.93  
12  Garrett      Vargas                 1453719.46  
13  Lynn         Tsoflias               1421810.92  
14  Pamela       Ansman-Wolfe           1352577.13  

The following example calculates row numbers for all rows in the SalesOrderHeader table in the order of the OrderDate and returns only rows 50 to 60 inclusive.

USE AdventureWorks2012;  
GO  
WITH OrderedOrders AS  
(  
    SELECT SalesOrderID, OrderDate,  
    ROW_NUMBER() OVER (ORDER BY OrderDate) AS RowNumber  
    FROM Sales.SalesOrderHeader   
)   
SELECT SalesOrderID, OrderDate, RowNumber    
FROM OrderedOrders   
WHERE RowNumber BETWEEN 50 AND 60;  

The following example uses the PARTITION BY argument to partition the query result set by the column TerritoryName. The ORDER BY clause specified in the OVER clause orders the rows in each partition by the column SalesYTD. The ORDER BY clause in the SELECT statement orders the entire query result set by TerritoryName.

USE AdventureWorks2012;  
GO  
SELECT FirstName, LastName, TerritoryName, ROUND(SalesYTD,2,1) AS SalesYTD,  
ROW_NUMBER() OVER(PARTITION BY TerritoryName ORDER BY SalesYTD DESC) 
  AS Row  
FROM Sales.vSalesPerson  
WHERE TerritoryName IS NOT NULL AND SalesYTD <> 0  
ORDER BY TerritoryName;  

Here is the result set.

  
FirstName  LastName             TerritoryName        SalesYTD      Row  
---------  -------------------- ------------------   ------------  ---  
Lynn       Tsoflias             Australia            1421810.92    1  
José       Saraiva              Canada               2604540.71    1  
Garrett    Vargas               Canada               1453719.46    2  
Jillian    Carson               Central              3189418.36    1  
Ranjit     Varkey Chudukatil    France               3121616.32    1  
Rachel     Valdez               Germany              1827066.71    1  
Michael    Blythe               Northeast            3763178.17    1  
Tete       Mensa-Annan          Northwest            1576562.19    1  
David      Campbell             Northwest            1573012.93    2  
Pamela     Ansman-Wolfe         Northwest            1352577.13    3  
Tsvi       Reiter               Southeast            2315185.61    1  
Linda      Mitchell             Southwest            4251368.54    1  
Shu        Ito                  Southwest            2458535.61    2  
Jae        Pak                  United Kingdom       4116871.22    1  

The following example returns the ROW_NUMBER for sales representatives based on their assigned sales quota.

-- Uses AdventureWorks  
  
SELECT ROW_NUMBER() OVER(ORDER BY SUM(SalesAmountQuota) DESC) 
    AS RowNumber,  
    FirstName, LastName,   
    CONVERT(varchar(13), SUM(SalesAmountQuota),1) AS SalesQuota   
FROM dbo.DimEmployee AS e  
INNER JOIN dbo.FactSalesQuota AS sq  
    ON e.EmployeeKey = sq.EmployeeKey  
WHERE e.SalesPersonFlag = 1  
GROUP BY LastName, FirstName;  

Here is a partial result set.


RowNumber  FirstName  LastName            SalesQuota  
---------  ---------  ------------------  -------------  
1          Jillian    Carson              12,198,000.00  
2          Linda      Mitchell            11,786,000.00  
3          Michael    Blythe              11,162,000.00  
4          Jae        Pak                 10,514,000.00  

The following example shows using the ROW_NUMBER function with the PARTITION BY argument. This causes the ROW_NUMBER function to number the rows in each partition.

-- Uses AdventureWorks  
  
SELECT ROW_NUMBER() OVER(PARTITION BY SalesTerritoryKey 
        ORDER BY SUM(SalesAmountQuota) DESC) AS RowNumber,  
    LastName, SalesTerritoryKey AS Territory,  
    CONVERT(varchar(13), SUM(SalesAmountQuota),1) AS SalesQuota   
FROM dbo.DimEmployee AS e  
INNER JOIN dbo.FactSalesQuota AS sq  
    ON e.EmployeeKey = sq.EmployeeKey  
WHERE e.SalesPersonFlag = 1  
GROUP BY LastName, FirstName, SalesTerritoryKey;  

Here is a partial result set.

 
RowNumber  LastName            Territory  SalesQuota  
---------  ------------------  ---------  -------------  
1          Campbell            1           4,025,000.00  
2          Ansman-Wolfe        1           3,551,000.00  
3          Mensa-Annan         1           2,275,000.00  
1          Blythe              2          11,162,000.00  
1          Carson              3          12,198,000.00  
1          Mitchell            4          11,786,000.00  
2          Ito                 4           7,804,000.00  

Source: https://docs.microsoft.com/en-us/sql/t-sql/functions/row-number-transact-sql


Answer by Idris Rhodes

To avoid confusion, I replaced the constant value with NULL. In SQL Server, I have observed that this assigns a sequential number without actually sorting the rows -- an observed performance advantage, but not one that I've seen documented, so we can't depend on it.,I had a situation where I was importing a hierarchical structure into an application where a seq number had to be unique within each hierarchical level and start at 110 (for ease of subsequent manual insertion). The data beforehand looked like this... ,The order by clause of row_number() is specifying what column is used for the order by. By specifying a constant there, you are simply saying "everything has the same value for ordering purposes". It has nothing, nothing at all to do with the first value chosen.,I wanted the row_number() function to generate the new sequence numbers but adding 10 and then multiplying by 10 wasn't achievable as expected. To force the sequence of arithmetic functions you have to enclose the entire row_number(), and partition clause in brackets. You can only perform simple addition and substraction on the row_number() as such.

Just add the value to the result of row_number():

select 3258170 - 1 + row_number() over (order by (select NULL)) as idd

Source: https://stackoverflow.com/questions/15210069/manually-specify-starting-value-for-row-number/15210128


Answer by Harmony Johnson

-- Uses AdventureWorks  
  
SELECT ROW_NUMBER() OVER(ORDER BY SUM(SalesAmountQuota) DESC) 
    AS RowNumber,  
    FirstName, LastName,   
    CONVERT(varchar(13), SUM(SalesAmountQuota),1) AS SalesQuota   
FROM dbo.DimEmployee AS e  
INNER JOIN dbo.FactSalesQuota AS sq  
    ON e.EmployeeKey = sq.EmployeeKey  
WHERE e.SalesPersonFlag = 1  
GROUP BY LastName, FirstName;  

Source: https://www.codegrepper.com/code-examples/sql/rowid%2Bover%2Bin%2Bsql%2Bserver


Answer by Bailee Gonzalez

You cannot use ROW_NUMBER or any other analytic function for expr. That is, you cannot nest analytic functions, but you can use other built-in function expressions for expr. Please refer to "About SQL Expressions" for information on valid forms of expr.,ROW_NUMBER is a nondeterministic function. However, employee_id is a unique key, so the results of this application of the function are deterministic.,Scripting on this page enhances content navigation, but does not change the content in any way.,By nesting a subquery using ROW_NUMBER inside a query that retrieves the ROW_NUMBER values for a specified range, you can find a precise subset of rows from the results of the inner query. This use of the function lets you implement top-N, bottom-N, and inner-N reporting. For consistent results, the query must ensure a deterministic sort order.

For each department in the sample table oe.employees, the following example assigns numbers to each row in order of employee's hire date:

SELECT department_id, last_name, employee_id, ROW_NUMBER()
   OVER (PARTITION BY department_id ORDER BY employee_id) AS emp_id
   FROM employees;

DEPARTMENT_ID LAST_NAME                 EMPLOYEE_ID     EMP_ID
------------- ------------------------- ----------- ----------
           10 Whalen                            200          1
           20 Hartstein                         201          1
           20 Fay                               202          2
           30 Raphaely                          114          1
           30 Khoo                              115          2
           30 Baida                             116          3
           30 Tobias                            117          4
           30 Himuro                            118          5
           30 Colmenares                        119          6
           40 Mavris                            203          1
. . .
          100 Popp                              113          6
          110 Higgins                           205          1
          110 Gietz                             206          2

The following inner-N query selects all rows from the employees table but returns only the fifty-first through one-hundredth row:

SELECT last_name FROM 
   (SELECT last_name, ROW_NUMBER() OVER (ORDER BY last_name) R FROM employees)
   WHERE R BETWEEN 51 and 100;

Source: https://docs.oracle.com/cd/B19306_01/server.102/b14200/functions137.htm


Answer by Ryan George

ROWID is a pseudocolumn that uniquely defines a single row in a database table., Developer Quick Start DBaaS Developer Info ,They are a built-in, unique identifier for every row in a table.,ROWID values are unique within a table, but not necessarily unique within a database.

ROWID

Source: https://doc.splicemachine.com/sqlref_builtinfcns_rowid.html


Answer by Alejandra Lang

How to Find Duplicate Rows in SQL?,How to Eliminate Duplicate Rows in SQL,How to Use Rank Functions in SQL ,Window Functions in SQL Server

Solution:

SELECT ROW_NUMBER() OVER() AS num_row,
  code, 
  name
FROM furniture;

We can also assign row numbers using a column. In the example below, we number records sorted by name. We do this by passing in that argument to OVER along with ORDER BY(it sorts records according to the name column):

SELECT ROW_NUMBER() OVER(ORDER BY name) AS num_row,
  name, 
  code
FROM furniture;

The numbering provided by ROW_NUMBER() is independent of the order of rows in the result table. In the example below, we number records using the sorted column name (OVER(ORDER BY name)), but we display records in the result set according to another column (in our example, ORDER BY code).

SELECT ROW_NUMBER() OVER(ORDER BY name) AS num_row,
  name, 
  code
FROM furniture
ORDER BY code;

The default order of the sorted rows is ascending, but you can also sort in descending order using the DESC keyword after the name of the column by which you want to sort:

SELECT ROW_NUMBER() OVER(ORDER BY name ASC) AS num_row,
  name, 
  code
FROM furniture
ORDER BY code DESC;

Source: https://learnsql.com/cookbook/how-to-number-rows-in-sql/