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SQL Server VARCHAR Column Length Modification
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- Basic Information
- VARCHAR column length can be increased without losing existing data
- ALTER TABLE command is used to modify column properties
- NULL or NOT NULL constraints must be specified
- Implementation
- Command format: ALTER TABLE ALTER COLUMN column_name VARCHAR(length)
- Works for CHAR, NCHAR, NVARCHAR, and other column types
- Multiple columns can be modified using separate ALTER commands
- Important Notes
- Cannot modify multiple columns in single ALTER command
- Constraint changes require removing violating rows first
- Works on SQL Server 2008, 2014, and 2019 editions
- Example demonstrates length increase from 50 to 100 characters