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What if I don't specify null or not null in SQL Server?
If you do not specify NULL or NOT NULL, SQL will set an identity column as NOT NULL. Me, I'd always specify it, to avoid the confusion endemic to the existance of the SET ANSI_NULL_DFLT_OFF and SET ANSI_NULL_DFLT_ON commands. SQL Server (2008, and probably earlier versions as well) will not allow you to create an identity column on a NULL column.

How to check if sqlbulkcopy is generating null values?
SqlBulkCopy just copies the data from DbDataReader and if it's results to null values, you need to check the source file. I suppose that your Excel file has more rows than just 3 (1 for columns and 2 for data). You can save your Excel e.g. in CSV format and open it in Notepad to see how many rows it will generate.

How to test for null value in a tuple?
to test for null value in a tuple. Many tautologies do not hold for columns with NULLs. Most SQL operators are NULL-intolerant. They return unknown if an operand is NULL. Consider aggregating values for budget in the following. Only non-NULL values included in aggregations. e.g., {(A,B,NULL),(A,B,C)} ∩ {(A,B,D),(A,B,NULL)} = {(A,B,NULL)}

Should null be replaced by two Null-type markers?
The ISO SQL implementation of Null is the subject of criticism, debate and calls for change. In The Relational Model for Database Management: Version 2, Codd suggested that the SQL implementation of Null was flawed and should be replaced by two distinct Null-type markers.

[PDF File]NULLS in SQL Null Values
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How does SQL cope with tables that have NULLs ? Null Values C1 AND C2 = min(C1, C2) C1 OR C2 = max(C1, C2) NOT C1 = 1 – C1 SELECT * FROM Person WHERE (age < 25) AND (height > 6 OR weight > 190) E.g. age=20 height=NULL weight=200 Rule in SQL: include only tuples that yield TRUE Outline Nulls (6.1.6 - 6.1.7)

[PDF File]Firebird Null Guide
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This guide explores the behaviour of NULL in Firebird SQL, points out common pitfalls and shows you how to deal safely with expressions that contain NULL or may resolve to NULL. If you only need a quick reference to refresh your memory, go to the summary at the end of the guide. So — what is it? In SQL, NULL is not a value.

[PDF File]Incomplete Information: Null Values - University of Edinburgh
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• Nullscannotbeusedexplicitlyinoperationsandselections: WHERE R.A=NULL or SELECT 5-NULL are illegal. • For any arithmetic, string, etc. operation, if one argument is null, then the result is null. • For R.A={1,null}, S.B={2}, SELECT R.A + S.B FROM R, S returns {3, null}. • What are the values of R.A=S.B? When R.A=1, S.B=2, it is false.

[PDF File]Tutorial 5: SQL - Department of Computer Science, University ...
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The two rows are duplicates if corresponding columns are either equal, or both contain null. (If we compare two null values using =, the result is unknown) The arithmetic operation +, -, * and / all return null if one of their arguments is null. Count(*) handle null values just like other values.

[PDF File]NULL VALUES - Cheriton School of Computer Science
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For convenience, SQL’s join operator (algebra’s ⋈

[PDF File]Null Values. SQL Constraints - UMass Boston CS
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Lecture 10 Slides based on “Database Management Systems” 3rd ed, Ramakrishnan and Gehrke Null Values Field values in a tuple may sometimes be unknown: e.g., a rating has not been assigned, or a new column is added to the table inapplicable: e.g., CEO has no manager, single person has no spouse

And select sqlupper null is null tbkw