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Do I need a primary key for my table, which has a UNIQUE (composite 4-columns), one of which can be NULL?

postgresql database-design null indexing primary-key

Unique if not null SQLAlchemy and Django

sql django null sqlalchemy unique

Compare a value to null. Why is this true?

r null logical-operators

SQL And NULL Values in where clause

sql sql-server sql-server-2008 null

SQL and logical operators and null checks

sql sql-server postgresql null

Where is my banana? (SQL Query NULL issue)

sql sql-server null

Why when I insert a DateTime null I have "0001-01-01" in SQL Server?

c# sql sql-server null default

When does Core Data Nullify rule update relations?

ios objective-c cocoa-touch core-data null

Field value must be unique unless it is NULL

sql sql-server sql-server-2005 null

Difference between null and not initialized?

c# null initialization

A nil pointer is sent to chan, but a "non-nil" received

go null

How to differentiate between empty string and null with OpenCSV

java null opencsv

Avro Schema. How to set type to "record" and "null" at once

null schema union record avro

what is the correct way to read from a datarow if the cell might be null

c# null datarow

Should we allow null/empty parameters?

parameters null code-contracts

Javascript document.getElementById("id").value returning null instead of empty string when the element is an empty text box

javascript string dom null

Efficiently drop dataframe rows where *index* contains nulls (NaT)

python pandas null

Can a WPF ComboBox display alternative text when its selection is null?

wpf xaml combobox null

What is the difference between 'foo = Nothing' and 'foo is Nothing' in VB.NET?

vb.net syntax null

"To Be or Not to Be" about variables in JavaScript

javascript variables null
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