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SQL ALTER TABLE statement
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SQL Server: ALTER TABLE ADD Columns in a Table
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ALTER TABLE でテーブルのカラムを追加・変更・削除する - T-SQL でテーブルの作成・変更・削除 - SQL Server 入門
SQL Server: ALTER TABLE ADD Columns in a Table
add new column to existing table in sql server - YouTube
Altering a column in a large table: A case study | SQL Studies
