Joining Two Rows (single table) to Single Row, Multiple columns
You Simply have to do a Two JOINs on the same Table

SELECT n.name, i1.info AS info_1, i2.info AS info_2
FROM names n
LEFT JOIN info i1 ON i1.ID = n.ID
LEFT JOIN info i2 ON i2.ID = n.ID_2


Just like here http://sqlfiddle.com/#!9/9f703e/1/0



For the Summed one, You have to use COLEACES to calculate the NULL values like the following

SELECT n.name, (COALESCE(i1.info, 0) + COALESCE(i2.info, 0)) AS Info_Sum
FROM names n
LEFT JOIN info i1 ON i1.ID = n.ID
LEFT JOIN info i2 ON i2.ID = n.ID_2


Just like here http://sqlfiddle.com/#!9/9f703e/3/0



In your next question I hope if you create the Table in SQLFiddle or dbfiddle and share it Or put the CREATE code so we can built the Table quickly to provide faster answers.