[skipped] This is where using sets becomes really tedious, as Postgres severely lacks an upsert-like statement.I don't think there are joins allowed in UPDATE statement, so I will need to use WITH query, right?Also, I'm not sure how LEFT JOIN will help me isolate and insert "missed" entries... [skipped] Yes, you can do UPDATE with joins (http://www.postgresql.org/docs/9.4/static/sql-update.html) like this: UPDATE table1 A SET col1 = B.col2 FROM table2 B WHERE A.col3 = B.col4;
[skipped]
This is where using sets becomes really tedious, as Postgres severely lacks an upsert-like statement.
I don't think there are joins allowed in UPDATE statement, so I will need to use WITH query, right?
Also, I'm not sure how LEFT JOIN will help me isolate and insert "missed" entries...
Yes, you can do UPDATE with joins (http://www.postgresql.org/docs/9.4/static/sql-update.html) like this:
UPDATE table1 A SET col1 = B.col2
FROM table2 B
WHERE A.col3 = B.col4;
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