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Add support for DEFAULT clause in MySQL ALTER TABLE .. MODIFY · Issue #9247 · jOOQ/jOOQ · GitHub
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ALTER TABLE MySQL | How to use an ALTER Table with Query Examples
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DB2 Add Column to DB2 Database Tables via the Alter Table Command
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Add a column with a default value to an existing table in SQL Server - Stack Overflow
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Working with DEFAULT constraints in SQL Server
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SQL Server ALTER TABLE ADD Column overview
