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STRING_AGG is an aggregate function that takes all expressions from rows and concatenates them into a single string. Expression values are implicitly converted to string types and then concatenated. The implicit conversion to strings follows the existing rules for data type conversions.
The STRING_AGG function concatenates strings separated by a specified separator. This was introduced with SQL Server 2017.
The STRING_AGG() is an aggregate function that concatenates rows of strings into a single string, separated by a specified separator. It does not add the separator at the end of the result string. In this syntax: input_string is any type that can be converted VARCHAR and NVARCHAR when concatenation.
PSA: STRING_AGG is actually available for SQL Server 2016.
With postgres 9.0+ you can write:
select string_agg(product,' | ' order by product) from "tblproducts"
Details here.
https://docs.microsoft.com/en-us/sql/t-sql/functions/string-agg-transact-sql?view=sql-server-2017
SELECT
STRING_AGG(prod, '|') WITHIN GROUP (ORDER BY product)
FROM ...
select string_agg(prod,' | ') FROM
(SELECT product as prod FROM tblproducts ORDER BY product )MAIN;
SQL FIDDLE
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