sql merge rows into one row in table code example

Example 1: sql select merge multiple values

DECLARE @combinedString VARCHAR(MAX)
SELECT @combinedString = COALESCE(@combinedString + ', ', '') + column_name
FROM table_name
WHERE ID = 1234

SELECT @combinedString as StringValue

Example 2: sql roll up rows into columns

SELECT 
   SS.SEC_NAME,
   STUFF((SELECT '; ' + US.USR_NAME 
          FROM USRS US
          WHERE US.SEC_ID = SS.SEC_ID
          ORDER BY USR_NAME
          FOR XML PATH('')), 1, 1, '') [SECTORS/USERS]
FROM SALES_SECTORS SS
GROUP BY SS.SEC_ID, SS.SEC_NAME
ORDER BY 1

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