In SQL Server, you can concatenate text from multiple rows into a single text string using the FOR XML PATH clause and the STUFF function. Here's an example:
DECLARE
@concatenatedString VARCHAR(MAX)
SELECT
@concatenatedString =STUFF((SELECT', '+
column_name
FROM
table_name
FORXMLPATH('')), 1, 2,'')
SELECT @concatenatedString
In this example, the SELECT statement inside the STUFF function concatenates the values from the column_name in the table_name table, separated by a comma and a space. The FOR XML PATH('') clause is used to concatenate the values into a single string. The STUFF function then removes the first two characters (the comma and the space) from the string. Finally, the result is stored in the @concatenatedString variable.
For the SQL Server 2017 or higher version you can use the STRING_AGG() function, here is the example;
SELECT
STRING_AGG(Coulmn_Name,',') col_nm
FROM Table1
Where Coulmn_Name is the column you want to concatenate value in a single text.