Merge multiple rows to one single column for a unique user

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Hi volks,

I need help on here on this.

I´ve got this structure containing multiple records for a user.

USERID   CITY         CITY_ID    TYPE
1	     London	      6	         1
1	     Liverpool    2	         2


Based on the type of 2 fields need to be populated 

When type = 1: STOREDID should be populated
When type = 2: OUTLETID should be populated

The final output should look like the following:

USERID | STORE_ID  | OUTLETID
1      | 6         | 2

SQL

CREATE TABLE TMP_USERS_TOUCH_POINT
(
ID INT IDENTITY(1,1) NOT NULL PRIMARY KEY
,USERID INT NOT NULL
,CITY NVARCHAR(100) NOT NULL
,STORE_TYPE INT NOT NULL
,CITY_ID INT
)

INSERT INTO TMP_USERS_TOUCH_POINT
VALUES (1,'LONDON',1,6)
,(2,'LIVERPOOL',1,2)

How can I achieve such a result?

Thanks for your help upfront..

What I have tried:

Using a pivot but did not succeed

Posted 2-May-20 5:22am

giantsover

Updated 3-May-20 6:08am

v2

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hari19113 3-May-20 11:01am

Is your given data wrong, it doesn't match the question and values.

1 solution

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hari19113 · Accepted Answer · 2020-05-03T05:07:00

The following code works with below data.

ID	USERID	CITY	         STORE_TYPE	  CITY_ID
1	1	    LONDON	         1	          6
2	1	    LIVERPOOL        2	          2

  SELECT	A.USERID		, 			
			MAX(CASE WHEN A.STORE_TYPE = 1 
					 THEN A.CITY_ID END) AS STORE_ID,
			MAX(CASE WHEN A.STORE_TYPE = 2 
					 THEN A.CITY_ID END) AS OUTLETID
	FROM	TMP_USERS_TOUCH_POINT A
GROUP BY	A.USERID

Output:

USERID	  STORE_ID	OUTLETID
1	      6	        2

Hope this helps you.