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:

  min(pos) as firstzero
from (
    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, 
ROW_NUMBER() OVER(PARTITION BY clientid ORDER BY calendar) AS counter_
FROM table
clientID, MIN(counter_) AS FirstZero
FROM cte 

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

Demo Fiddle

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)

  • 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