sql query to select columns from multiple tables 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 select rows with different values in one column

SELECT *
FROM YourTable
WHERE ARIDNR IN (
    SELECT ARIDNR
    FROM YourTable
    GROUP BY ARIDNR
    HAVING COUNT(*) > 1
)

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