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SQL Add Column with Default Value

Yapay zekadan makale özeti

Basic Concepts: Default constraint specifies default value for columns
SQL ALTER TABLE statement modifies existing tables
Default constraint can be added during table creation or later
Syntax: ALTER TABLE ADD COLUMN requires table name, column name, and constraint
Default keyword and value specify default constraint
Implementation Examples: Single int column can have default value specified
Varchar columns require character length specification
Multiple columns can be added using comma-separated list
Multiple constraints can be combined with default and NOT NULL
Implementation Details: Default values automatically added when new records are inserted
Column constraints can be added or removed
NOT NULL constraint enforces mandatory column value