How to Query Changes in a Temporal Table by Time Range

Querying Changes Within a Specific Time Range

Write a SQL query to retrieve changes made within a specific time range in a temporal table.

Solution:

-- Retrieve changes made between January 1, 2023, and December 31, 2023.
SELECT EmployeeID, Name, Position, SysStartTime, SysEndTime
FROM Employees
FOR SYSTEM_TIME BETWEEN '2023-01-01' AND '2023-12-31'
ORDER BY SysStartTime;

Explanation:

• Purpose of the Query :
• The goal is to demonstrate how to query changes made within a specific time range.
• Key Components :
• FOR SYSTEM_TIME BETWEEN: Retrieves all versions of rows valid within the specified range.
• Includes SysStartTime and SysEndTime to track when each version was valid.
• Why Query Time-Ranged Changes? :
• Tracking changes over time provides insights into trends, anomalies, and patterns.
• It supports detailed auditing and analysis.
• Real-World Application :
• In sales systems, querying changes tracks order modifications over a fiscal year.

For more Practice: Solve these Related Problems:

• Write a SQL query to retrieve changes made between January 1, 2022, and December 31, 2022, in a temporal table named "Orders".
• Write a SQL query to fetch modifications that occurred during the fiscal year 2023 in a temporal table named "Expenses".
• Write a SQL query to extract changes made during the first quarter of 2023 in a temporal table named "Inventory".
• Write a SQL query to identify updates that happened between two specific timestamps in a temporal table named "AuditLogs".

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