## Using the Row_Number function

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My data looks like this -

clientid calendar Num 18161 20170518 1 18161 20170705 0 18161 20170718 0 43431 20150518 0

The first 0 `Num`

for `18161`

client is on the 2nd calendar. The first 0 `Num`

for `43431`

client is on the 1st calendar (`20150518`

). I want a SQL to generate this output -

clientid FirstZero 18161 2 43431 1

This is what I have so far, but the row_number is being generated for all `calendars`

. I need it just for the first time `Num`

becomes zero for a particular client.

SELECT clientid, calendar, Row_Number() Over (order by clientid) As FirstZero from DAILY where num = 0 and clientid = 18161

Here you go:

select clientid, min(pos) as firstzero from ( select clientid, num, row_number() over(partition by clientid order by calendar) as pos from daily ) x where num = 0 group by clientid

**SQL Server ROW_NUMBER() Function Explained By Practical ,** To add a row number column in front of each row, add a column with the ROW_NUMBER function,� SQL ROW_NUMBER () Function Overview First, the PARTITION BY clause divides the result set returned from the FROM clause into partitions. The PARTITION BY Then, the ORDER BY clause sorts the rows in each partition. Because the ROW_NUMBER () is an order sensitive function, Finally, each row in

You could use a CTE to make your row_numbers, and then find the MIN()

;WITH cte AS ( SELECT clientID, Calendar, Num, ROW_NUMBER() OVER(PARTITION BY clientid ORDER BY calendar) AS counter_ FROM table ) SELECT clientID, MIN(counter_) AS FirstZero FROM cte WHERE Num=0 GROUP BY clientID

**ROW_NUMBER (Transact-SQL),** This tutorial shows you how to use the ROW_NUMBER() to assign a sequential number to each row in a query result� In this example: First, the PARTITION BY clause divided the rows into partitions by category id. Then, the ORDER BY clause sorted the products in each category by list prices in descending order. Next, the ROW_NUMBER () function is applied to each row in a specific category id. It re-initialized the

with fz as ( SELECT clientid, calendar, num, Row_Number() Over (partition by clientId order by calendar) As FirstZero from DAILY ), gz as ( select clientid, min(FirstZero) as FirstZero from fz where num = 0 group by clientId ) select d.clientId, d.calendar, gz.firstZero from Daily d inner join fz on d.clientId = fz.clientId and d.calendar = fz.calendar inner join gz on fz.clientId = gz.clientId and fz.firstZero = gz.firstZero --where d.clientId = 18161

**SQL ROW_NUMBER() Function,** How to use ROW_NUMBER in SQL Query. The following examples, we'll see the use of OVER clause. To show the row number in SQL Server, you need to use the ROW_NUMBER function. This function is broken down in to two parts. PARTITION BY – If you supply this parameter, then the row number will reset based on the value changing in the columns supplied. This is kinda like using a GROUP BY.

**Overview of the SQL ROW_NUMBER function,** In this tutorial, you will learn how to use the Oracle ROW_NUMBER() function to assign a unique sequential integer to� 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. The following shows the syntax of the ROW_NUMBER () function: ROW_NUMBER () OVER ([PARTITION BY partition_expression,

**Oracle ROW_NUMBER Function by Practical Examples,** Example. To limit the number of rows returned from a query to the 10 first rows of table T , use the following query: The most commonly used function in SQL Server is the SQL ROW_NUMBER function. The SQL ROW_NUMBER function is available from SQL Server 2005 and later versions. ROW_NUMBER adds a unique incrementing number to the results grid. The order, in which the row numbers are applied, is determined by the ORDER BY expression.

**ROW_NUMBER function,** ROW_NUMBER is an analytic function. You cannot use ROW_NUMBER or any other analytic function for expr . The Db2 ROW_NUMBER () is a window function that assigns each row in a result set a unique sequential integer. The first sequential number is one assigned to the first row. Here is the syntax of the ROW_NUMBER () function: ROW_NUMBER () OVER ([partition_clause] order_by_clause)

##### Comments

- And? That is what you have so far, and what is wrong with it?
- @dfundako I have updated my question.
- What's that semicolon right at the beginning? (I've seen several posts with it)
- @TheImpaler Standard SQL Server syntax for a CTE so it doesn't throw a "previous statement must be terminated with semicolon" error