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Difference between DateTime and SmallDateTime in SQL Server Video Lecture | SQL Server Administration: Basic Tutorials - Database Management

FAQs on Difference between DateTime and SmallDateTime in SQL Server Video Lecture - SQL Server Administration: Basic Tutorials - Database Management

1. What is the difference between DateTime and SmallDateTime in SQL Server Database Management?

Ans. DateTime and SmallDateTime are both data types in SQL Server for storing date and time values. The main difference between them is the range of values they can store and the amount of storage space they require. The DateTime data type can store dates from January 1, 1753, to December 31, 9999, with an accuracy of 3.33 milliseconds. It requires 8 bytes of storage space. On the other hand, the SmallDateTime data type can store dates from January 1, 1900, to June 6, 2079, with an accuracy of 1 minute. It requires 4 bytes of storage space.

2. How do DateTime and SmallDateTime handle time zone information?

Ans. Both DateTime and SmallDateTime data types in SQL Server do not store any time zone information. They only store the date and time values without any reference to a specific time zone. It is important to handle time zone conversions and adjustments in the application layer when working with these data types.

3. Can DateTime and SmallDateTime store only date values without the time component?

Ans. Yes, both DateTime and SmallDateTime data types can store only date values without the time component. By setting the time part of the value to 0:00:00 or by using the CAST or CONVERT functions, you can effectively store and retrieve only the date portion of a DateTime or SmallDateTime value.

4. Can you convert a DateTime value to a SmallDateTime value and vice versa?

Ans. Yes, it is possible to convert a DateTime value to a SmallDateTime value and vice versa. However, there are some limitations to be aware of. When converting a DateTime value to a SmallDateTime value, the time component with a granularity of milliseconds will be rounded to the nearest minute. This can result in loss of precision. When converting a SmallDateTime value to a DateTime value, the time component will be set to 00:00:00, effectively removing the original time value.

5. Can DateTime and SmallDateTime be used interchangeably in SQL queries and calculations?

Ans. DateTime and SmallDateTime can be used interchangeably in most SQL queries and calculations. However, it's important to note that due to the difference in their range and precision, there may be some limitations and considerations. For example, if you are comparing DateTime and SmallDateTime values, the comparison can behave differently due to the rounding of milliseconds in SmallDateTime. Also, if you are performing calculations involving time intervals, the smaller precision of SmallDateTime may affect the accuracy of the results. It is recommended to choose the appropriate data type based on the specific requirements of your application to ensure accurate and efficient data manipulation.

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Oct 22, 2025 Last updated

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