Ms sql server row_number rowid starts by
Asked by Izabella Cobb onAnswer 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)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
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
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;
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;
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
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;
