関連ワード:  what is string_agg in sql server    what is alternative for string_agg in sql server    what is the use of string_agg in sql server    string_agg in sql server 2016    string_agg in sql server example    string_agg in sql server w3schools    string_agg in sql server 2012    string_agg in sql server 2014    string_agg in sql server with order by    string_agg in sql server not recognized