在 SQL 服务器中合并具有同一列的多行

Question

What is the most efficient method to combine multiple rows of values with the same column in SQL Server?

data table

category	segment	payment
01	A	1425
01	B	7647
01	A	6164
01	B	3241

And I'm trying to achieve the following result

category	segment	payment
01	A	1425+6164
01	B	7647+3241

I want to merge the rows when the category and segment are same.

Thanks in Advance!

Answer 1

Use This

SELECT category,segment,payment = STUFF((
                                SELECT '+' + CONVERT(VARCHAR,payment)
                                FROM TABLENAME t
                                WHERE t.category = TABLENAME.category AND t.segment = TABLENAME.segment                               
                                FOR XML PATH('')
                                ), 1, 1, '')
FROM TABLENAME 
GROUP BY category,segment

if you get payment with + sign then use stuff like this.

SELECT category,segment,SUM(payment) as payment
FROM TABLENAME 
GROUP BY category,segment

if you want sum then remove stuff and use Sum(payment) only.

Answer 2

You can use the SUM aggregate function with a GROUP BY clause like so:

SELECT category, segment, SUM(payment) AS 'payment'
FROM table
GROUP BY category, segment

Answer 3

if you want actual total, then you can aggregate and summarize:

select category, segment, sum(payment)
from table
group by category, segment

if you want string, you can try something like that (for mysql):

select category, segment, GROUP_CONCAT(payment SEPARATOR '+')
from table
group by category, segment

Answer 4

your table

 declare @t TABLE (
   category int  NOT NULL 
  ,segment  NVARCHAR(50) NOT NULL
  ,payment  int  NOT NULL
);
INSERT INTO @t(category,segment,payment) VALUES (01,'A',1425);
INSERT INTO @t(category,segment,payment) VALUES (01,'B',7647);
INSERT INTO @t(category,segment,payment) VALUES (01,'A',6164);
INSERT INTO @t(category,segment,payment) VALUES (01,'B',3241);

if you want payment column as string then use following

SELECT
category, 
segment,
    STRING_AGG(cast(payment as nvarchar(50)),'+') 
        WITHIN GROUP (ORDER BY category) payment
FROM
   @t T
GROUP BY
    category,segment

if you want payment column as NUMBER then use following

SELECT
category, 
segment,
SUM(payment) AS payment 
FROM
   @t T
GROUP BY
    category,segment