関連ワード:  string_agg function in sql server    string_agg function in sql server 2016    string_agg function in sql server 2012    string aggregate function in sql server    string aggregate functions in sql server 2012    string aggregate functions in sql server w3schools    string_agg window function sql server    create string_agg function sql server    alternative function for string_agg in sql server    string_agg is not a recognized built in function name sql server