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The problem with val = null
Demo of problems and quirks with null
Nulls in aggregate functions
Nulls in check constraints
Nulls in ORDER BY
Why does null exist?
Examples of not applicable/missing information and ways to change the schema to avoid null
Handling end dates for currently active rows - null vs separate tables vs magic values
The problem with magic values
Situations where nulls can still appear when all columns are mandatory: outer joins, new columns, and window functions
Demo of nulls in outer joins
Nulls returned by window functions
Mapping nulls to non-null values
How to include nulls when searching for rows less than some value