Filling not applicable fields with N/A rather than leaving them empty or Null
72088
Why shouldn't we allow NULLs?
56652
Cannot add a NOT NULL column with default value NULL in Sqlite3
104501
How do I enforce null checking?
16236
Is it possible to enforce unique values in a column, excluding nulls?
94839
Check whether a string is not null and not empty
118065
Including null values in unpivoted column
62914
Insert null/empty value in sql datetime column by default
10652
Removal of lines with no more or fewer than 'N' fields?
81776
Replacing all null values from attribute table with zeros in QGIS
112485
Allowing the zero element in a field to have an inverse
118970
How do I include nulls during comparisons in SQL Server?
12633
Filling any empty cells with the value above
158391
Most efficient way to check for DBNull and then assign to a variable?
83354
Nullable types: better way to check for null or zero in c#
46729
Add non-nullable columns to an existing table in SQL server?
115231
Deep null checking, is there a better way?
132469
Autofilling fields based on another field