How can I reset the counter like below examples (I need to generate counter in the column named "Counter I need to generate"?
Looks like each value larger than 1 resets the counter, is that right?
If so, you could assign a group number first, based on the number of times a value > 1 occurs before the current row (including). So row 1 to 11 will be group 0, 12 and 13 will be group 1, and so on.
Then you can apply the row_number window function to generate the numbering partitioned by that group:
with VW_GROUPED as (
select
t.*,
(select count(*) from TheTable x where x.URN <= t.URN and x.GAPNOOFDAYS > 1) as GROUPNO
from
TheTable /* <- your table name here */ t)
select
g.URN,
g.CUSTOMER_ID,
g.GAPNOOFDAYS,
row_number() over (partition by GROUPNO order by URN) as "Counter I need to generate"
from
VW_GROUPED g
Here's an alternate example that generates the group in using analytic functions instead of a scalar subquery:
with grp as (
select t.*
, sum(case gapnoofdays when 1 then 0 else 1 end) over (partition by customer_id order by urn) grp
from your_table t
)
select grp.*
, row_number() over (partition by customer_id, grp order by urn) n
from grp;
Related
How to get the total row data that has max(reg_count).
When I try this, it gives me only max reg_count value. I want to get the whole row data that has max reg_count in every albumID.(So like this: 4 Bemisal ha 1 1 8) - total 4 rows
SELECT albumID, max(reg_count) as max_count
FROM contentnew
GROUP BY albumID
Please help me!
You don't mention the version of MySQL you are using so I'll assume it's a modern one (8.x). You can use the ROW_NUMBER() window function to identify the row you need.
For example:
select *
from (
select *,
row_number() over(partition by albumID order by reg_count desc) as rn
from contentnew
) x
where rn = 1
In MySQL 5.x you can use correlated subquery:
select *
from contentnew a
where a.reg_count = (
select max(reg_count)
from contentnew b
where b.albumID = a.albumID)
)
I am trying to select multiple rows of data into one row through multiple columns which will change dynamically.
This is in Oracle database. I want to count repeated work done by the LEAD_TECHNISIAN_ID within a duration. If the difference of last work delivery date and new work receive date is 15 or below 15 then LEAD_TECHNISIAN_ID has one repeated work.
List item
SELECT *
FROM (WITH CTE AS (
SELECT ROW_NUMBER () OVER (ORDER BY ID) AS RW,
RECEIVED_DATE,
DELIVERY_DATE,
SERVICE_NO,
LEAD_TECHNISIAN_ID,
ID,
SERVICE_CENTER
FROM ( SELECT cc.SERVICE_CENTER,
CC.ID,
CC.BARCODE,
TRUNC (cc.CREATED_DATE) RECEIVED_DATE,
TRUNC (CC.DELIVERY_DATE) DELIVERY_DATE,
cc.SERVICE_NO,
CC.LEAD_TECHNISIAN_ID
FROM customer_complains cc
WHERE cc.BARCODE IN (SELECT BARCODE
FROM (SELECT BARCODE,
COUNT (BARCODE)
FROM customer_complains c
WHERE c.BARCODE <> 'UNDEFINE'
AND C.BARCODE = NVL ('351950102757821', BARCODE)
AND c.SEGMENT3 = NVL ('',c.SEGMENT3)
AND c.SEGMENT3 IN (SELECT SEGMENT3
FROM ITEM_MST
WHERE PRODUCT_GROUP = NVL ('',PRODUCT_GROUP))
GROUP BY c.BARCODE
HAVING COUNT (c.BARCODE) >1))
ORDER BY ID DESC)
ORDER BY ID DESC)
SELECT a.id,
a.DELIVERY_DATE,
a.RECEIVED_DATE,
b.RECEIVED_DATE PRE_RCV,
b.DELIVERY_DATE PRE_DEL,
(a.RECEIVED_DATE - b.DELIVERY_DATE) AS DIFF,
a.SERVICE_NO,
a.LEAD_TECHNISIAN_ID,
b.LEAD_TECHNISIAN_ID PRE_TECH --, a.DELIVERY_DATE
FROM CTE a
LEFT JOIN CTE b ON a.RW = b.RW + 1
)
WHERE DIFF <= 15
Here is the output for a specific barcode. but when I try for All the barcode I have in My Customer_complains table. The query provides irrelevant output.
Currently your code is giving numbers 1,2,3,4... to rows irrespective of LEAD_TECHNISIAN_ID and then you are joining it with RW. It will not consider LEAD_TECHNISIAN_ID while giving row numbers.
RW must start with 1 for each LEAD_TECHNISIAN_ID.
You just need to change calculation of RW as following:
ROW_NUMBER () OVER (PARTITION BY LEAD_TECHNISIAN_ID ORDER BY ID) AS RW
Cheers!!
Table 1 has duplicate entries in column A with same frequency values. I need to select one random record out of those .If the duplicate entry contain 'unknown' as a column B value ( like in record "d") select one from other rows . I need a select statement which satisfy the above . Thanks .
These conditions can be prioritized using a case expression in order by with a function like row_number.
select A,B,frequency,timekey
from (select t.*
,row_number() over(partition by A order by cast((B = 'unknown') as int), B) as rnum
from tbl t
) t
where rnum = 1
Here for each group of A rows, we prioritize rows other than B = 'unknown' first, and then in the order of B values.
Use row_number analytic function. If you want to select not unknown record first, then use the query below:
select A, B, Frequency, timekey
from
(select
A, B, Frequency, timekey,
row_number() over(partition by A,Frequency order by case when B='unknown' then 1 else 0 end) rn
)s where rn=1
And if you want to select unknown if they exist, use this row_number in the query above:
row_number() over(partition by A,Frequency order by case when B='unknown' then 0 else 1 end) rn
I am getting "no results returned" for the following query:
SELECT
Referer
FROM
(SELECT
ROW_NUMBER() OVER (ORDER BY CT.Referer ASC) AS RowNum,
CT.Referer, CT.LastModified
FROM
ClickTrack CT
JOIN
OrderTrack OT ON OT.ClickTrackID = CT.ClickTrackID
GROUP BY
CT.Referer, CT.LastModified
HAVING
LEN(CT.Referer) > 0) as num
WHERE
RowNum = 1
AND LastModified BETWEEN '07/06/2013' and '08/05/2013'
Curiously, when I leave off RowNum = 1, I get the full list of values. I need to get one at a time though to assign to a variable and drop into a temporary table.
The end query will be in a while loop using scalar variables in place of the date ranges and RowNum comparison.
Any help is appreciated. Thank you!
I'm thinking RowNum 1 may not have a date between your selections. Maybe put the date selection inside so that you know that the first one matches.
SELECT Referer
FROM (SELECT ROW_NUMBER() OVER (ORDER BY CT.Referer ASC)
AS RowNum, CT.Referer, CT.LastModified
FROM ClickTrack CT
JOIN OrderTrack OT ON OT.ClickTrackID = CT.ClickTrackID
WHERE CT.LastModified BETWEEN '07/06/2013' and '08/05/2013'
GROUP BY CT.Referer, CT.LastModified
HAVING LEN(CT.Referer) > 0) as num
WHERE RowNum = 1
Table A
ID EmpNo Grade
--------------------
1 100 HIGH
2 105 LOW
3 100 MEDIUM
4 100 LOW
5 105 LOW
Query:
select *
from A
where EMPNO = 100
and rownum <= 2
order by ID desc
I tried this query to retrieve max and max-1 value; I need to compare the grade from max and max-1, if equals I need to set the flag as 'Y' or 'N' without using a cursor. Also I don't want to scan the entire record twice.
Please help me.
ROWNUM is applied before ORDER BY, so you need to nest the query like this:
select * from
(select * from A where EMPNO =100 order by ID desc)
where rownum<=2
That only performs one table scan (or it may use an index on EMPNO).
select *
from (
select id, emp_no, grade
, case
when lag(grade) over (order by emp_no desc) = grade
then 'Y'
else 'N'
end
as flag
, dense_rank() over( order by emp_no desc) as rank
from t
)
where rank <=2
;