SA0188 : The NULL or NOT NULL constraint not explicitly specified in the table column definition

The NULL or NOT NULL constraint not explicitly specified in the table column definition

The checks CREATE TABLE and ALTER TABLE ADD COLUMN statements for table column definitions not having explicit NULL constraint specified.

If the NOT NULL option is not explicitly specified when creating a table, the NULL value will be applied to all columns.

Therefore, it is recommended to always set the availability of empty values in a column when creating a table, or declaring a temporary table, or a table variable.

The rule has a Batch scope and is applied only on the SQL script.

Rule has no parameters.

The rule does not need Analysis Context or SQL Connection.

Design Rules, Code Smells

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 1CREATE TABLE Test.Greeting
 2(
 3GreetingId INT IDENTITY (1,1) PRIMARY KEY,
 4Message nvarchar(255) NOT NULL,
 5)
 6
 7ALTER TABLE Test.Greeting ADD Column2 INT, Column2 INT NULL
 8
 9ALTER TABLE dbo.doc_exa ADD column_b VARCHAR(20), column_c INT NULL ;  
10
11ALTER TABLE MyTable ALTER COLUMN NullCOl NVARCHAR(20) NOT NULL;

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