SQL Server - How to delete some rows of columns without disrupting the rest of the record - sql

Question

I have it
-- -- -- --
01 A1 B1 99
01 A1 B1 98
02 A2 B2 97
02 A2 B2 96
I need this
-- -- -- --
01 A1 B1 99
98
02 A2 B2 97
96
------------
I can not repeat the data that I will present in a excel,
My result needs to be just so.
In my actual table, the last column are responses of forms and the first columns (those that can not repeat) are customer data as (phone, name ...).
The end result of this "query" will populate a "DataTable" and will be presented in a file "xlsx".
Thanks for sharing knowledge ^^

Answer 1

If you have SQL2012+
SELECT
ISNULL(NULLIF(Column1,LAG(Column1) OVER(ORDER BY Column1)),'')
,ISNULL(NULLIF(Column2,LAG(Column2) OVER(ORDER BY Column1,Column2)),'')
,ISNULL(NULLIF(Column3,LAG(Column3) OVER(ORDER BY Column1,Column2,Column3)),'')
,Column4
FROM #mytable
ORDER BY Column1,Column2,Column3,Column4 DESC

Answer 2

It's a little messy, but you can do it in the database. You basically make a subquery that gets the smallest value, and then join that to the regular table and blank out values that don't match. I created your sample set like this:
CREATE TABLE mytable (N1 VARCHAR(2), A VARCHAR(2), B VARCHAR(2), N2 VARCHAR(2))
INSERT INTO mytable VALUES
('01', 'A1', 'B1', '99'),
('01', 'A1', 'B1', '98'),
('02', 'A2', 'B2', '97'),
('02', 'A2', 'B2', '96')
And then was able to get the result like this:
SELECT
CASE WHEN O.N2 = I.N2 THEN O.N1 ELSE '' END,
CASE WHEN O.N2 = I.N2 THEN O.A ELSE '' END,
CASE WHEN O.N2 = I.N2 THEN O.B ELSE '' END,
O.N2
FROM
(SELECT MAX(N2) AS N2, N1, A, B FROM mytable GROUP BY N1, A, B) I
INNER JOIN mytable O
ON O.A = I.A AND O.B = I.B AND O.N1 = I.N1
ORDER BY O.N1 ASC

Answer 3

we can use ROW_NUMBER to get the sequence and substitute '' for all rows where sequence is greater than 1
with CTE
AS
( SELECT ID, ColumnA, ColumnB, value,ROW_NUMBER() over ( PARTITION by id order by id) as seq
FROM tableA
)
, CTE1
AS
(
select id, ColumnA, ColumnB, value, seq from CTE where seq =1
UNION
SELECT id ,'','', value , seq from CTE where seq >1
)
SELECT case when seq >1 THEN NULL ELSE id END as id, columnA, columnB, value from CTE1

Answer 4

You can achieve what you want using a query.
You haven't provided DDL so I am going to asume your columns are called a, b, c and d respectively
; WITH cte AS (
SELECT a
, b
, c
, d
, Row_Number() OVER (PARTITION BY a, b, c ORDER BY d) As sequence
FROM your_table
)
SELECT CASE WHEN sequence = 1 THEN a ELSE '' END As a
, CASE WHEN sequence = 1 THEN b ELSE '' END As b
, CASE WHEN sequence = 1 THEN c ELSE '' END As c
, d
FROM cte
ORDER
BY a
, b
, c
, d
The idea is to assign an incremental counter to each row, that restarts after each change of a + b + c.
We then use a conditional statement to show a value or not (basically only show on the first instance of each group)

Answer 5

The analytic ROW_NUMBER() function is good for this. I've made up column names because you didn't supply any. To assign a row number by customer, use something like this:
SELECT
Name,
Phone,
Address,
Response,
ROW_NUMBER() OVER (PARTITION BY Name, Phone, Address ORDER BY Response) AS CustRow
FROM myTable
That will assign row number within each customer. Try it yourself and I think it will make sense.
You can put it into a subquery or CTE from there and only show customer ID information like name, phone, and address when you're on the first row for each customer:
SELECT
CASE WHEN CustRow = 1 THEN Name ELSE '' END AS Name,
CASE WHEN CustRow = 1 THEN Phone ELSE '' END AS Phone,
CASE WHEN CustRow = 1 THEN Address ELSE '' END AS Address,
Response
FROM (
SELECT
Name,
Phone,
Address,
Response,
ROW_NUMBER() OVER (PARTITION BY Name, Phone, Address ORDER BY Response) AS CustRow
FROM myTable) custSubquery
ORDER BY Name, Phone, Address
The custSubquery on the second-to-last line is because SQL Server requires all subqueries to be aliased, even if the alias isn't used.
The most important thing is to determine how your last column will be ordered for display and to make sure that it's consistent in the ROW_NUMBER() function as well as the final ORDER BY.
If you need more help, please supply table and column names, and specify how results are ordered within each customer.