New posts in Null

How can I set a column to NOT NULL without locking the table during a table scan?

NULL value causes blank row in SELECT results for text concatenation

How to get the last not-null value in an ordered column of a huge table?

Count NULL values per row

Conditional string concatenation in PostgreSQL

Why can't I use null values in joins?

Why does COUNT() aggregate return 0 for 'NULL'?

PostgreSQL UPSERT issue with NULL values

Using GROUP BY WITH ROLLUP on column that contains NULL

How do I order by NULLS LAST if my database doesn't support it?