Removing a Column from a Temporal Table in SQL

Dropping a Column from a Temporal Table

Write a SQL query to drop a column from a temporal table.

Solution:

-- Drop a column from the Employees temporal table.
ALTER TABLE Employees DROP COLUMN Department;

Explanation:

• Purpose of the Query :
• The goal is to demonstrate how to drop a column from a temporal table.
• Key Components :
• ALTER TABLE: Modifies the table schema.
• DROP COLUMN: Removes the specified column from the table.
• Why Drop a Column? :
• Dropping unused or obsolete columns simplifies the schema and reduces storage overhead.
• It ensures data relevance and compliance.
• Real-World Application :
• In legacy systems, dropping unused columns cleans up outdated data.

Additional Notes:

• Ensure that the column is not referenced by other objects before dropping.
• Test schema changes in a development environment first.
• Important Considerations:
• Communicate schema changes to stakeholders.

For more Practice: Solve these Related Problems:

• Write a SQL query to drop the "MiddleName" column from a temporal table named "Employees".
• Write a SQL query to remove a deprecated column named "OldID" from a temporal table.
• Write a SQL query to drop a column named "TemporaryFlag" that is no longer needed in a temporal table.
• Write a SQL query to remove a redundant column named "LegacyCode" from a temporal table.

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Previous SQL Exercise: Adding a New Column to a Temporal Table.
Next SQL Exercise: Querying the Latest Version of Each Row.