Is it possible for unique column to contain multiple null values SQL Server 2008
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Why does a UNIQUE constraint allow only one NULL?
141930
Implementing a "Both, Either-or, but Not Null" Requirement in a Database
74562
ORA-02270: no matching unique or primary key for this column-list
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Failed to enable constraints. One or more rows contain values violating non-null, unique, or foreign-key constraints
63897
How do I return a new IDENTITY column value from an SQLServer SELECT statement?
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SQL query that concatenates values from duplicate rows in a single table
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sql unique constraint on a 2 columns combination
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SQL Server 2008: Can a multi-statement UDF return a UDT?
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How to specify null value in MS Access through the JDBC-ODBC bridge?
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Adding a constraint to prevent duplicates in SQL Update Trigger
124471
Comparing nullable column values using "IS NULL" versus "= NULL"
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SQL: Select columns with NULL values only
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Including null values in unpivoted column
79832
Why are there gaps in my IDENTITY column values?
129385
How to check if a column exists in a SQL Server table?
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In SQL Server 2005, how do I set a column of integers to ensure values are greater than 0?
140374
Add a column with a default value to an existing table in SQL Server