Well, even if you don't use family, you will get an error that column
date_time is undefined. Consider the result of UNION ALL as a separate
table and ORDER BY is applied to this table. You don't have column
date_time there. Don't forget that UNION ALL may work with different
tables, so there may
I get "Undefined column family. familyName=f" whenever I run the following
query,it works without the ORDER BY and works with the ORDER BY if its not
a union and just one select statement
SELECT
p.name
FROM
person p
JOIN
friends f
