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"ALTER TABLE ... ADD" - Adding New Columns to Existing Tables in SQL Server
How To Add a New Column to an Existing Table with "ALTER TABLE ... ADD" in SQL Server?
✍: FYIcenter.com
If you have an existing table with existing data rows, and want to add a new column to that table, you can use the "ALTER TABLE ... ADD" statement. The tutorial script below shows you a good example:
ALTER TABLE tip ADD author VARCHAR(40) GO sp_columns tip GO TABLE_OWNER TABLE_NAME COLUMN_TABLE TYPE_NAME ... dbo tip id int ... dbo tip subject varchar ... dbo tip description varchar ... dbo tip create_date datetime ... dbo tip author datetime ... SELECT * FROM tip GO id subject description create_date author 1 Learn SQL Visit dev.fyicenter.com 2006-07-01 NULL
This SQL script added a new column called "author" to the "tip" table. NULL values were added to this column on all existing data rows.
⇒ "ALTER TABLE ... DROP COLUMN" - Deleting Existing Columns in SQL Server
⇐ "SELECT ... INTO" - Creating New Tables With Queries in SQL Server
2016-11-17, 2038🔥, 0💬
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