What is the difference between datetime and datetime?

What is the difference between datetime and datetime?

DATE: It is used for values with a date part but no time part. DATETIME: It is used for values that contain both date and time parts. MySQL retrieves and displays DATETIME values in YYYY-MM-DD HH:MM:SS format. The supported range is 1000-01-01 00:00:00 to 9999-12-31 23:59:59 .

What are the main differences between datetime and timestamp?

In MySQL5+, TIMESTAMP value converts from the current time to UTC and vice-versa while DATETIME does not do any conversion. TIMESTAMPdiffers with current time zone settings while DATETIME remains constant. TIMESTAMP data can be indexed while the DATETIME data cannot.

Should I use timestamp or datetime?

Timestamps in MySQL are generally used to track changes to records, and are often updated every time the record is changed. If you want to store a specific value you should use a datetime field.

What is a datetime?

DateTime is a structure that can never be null. From MSDN: The DateTime value type represents dates and times with values ranging from 12:00:00 midnight, January 1, 0001 Anno Domini, or A.D. (also known as Common Era, or C.E.) through 11:59:59 P.M., December 31, 9999 A.D. (C.E.)

What are date and datetime Are there any other date data types?

The DATETIME type is used for values that contain both date and time parts. MySQL retrieves and displays DATETIME values in ‘ YYYY-MM-DD hh:mm:ss ‘ format. The supported range is ‘1000-01-01 00:00:00’ to ‘9999-12-31 23:59:59’ . The TIMESTAMP data type is used for values that contain both date and time parts.

Which data type should be classified as a date time?

Date and Time data types

Data type Format User-defined fractional second precision
time hh:mm:ss[.nnnnnnn] Yes
date YYYY-MM-DD No
smalldatetime YYYY-MM-DD hh:mm:ss No
datetime YYYY-MM-DD hh:mm:ss[.nnn] No

Why do we use timestamp?

When the date and time of an event is recorded, we say that it is timestamped. Timestamps are important for keeping records of when information is being exchanged or created or deleted online. In many cases, these records are simply useful for us to know about. But in some cases, a timestamp is more valuable.

Can I use timestamp as primary key?

1) If values of timestamp are unique you can make it primary key. If not, anyway create index on timestamp column as you frequently use it in “where”. 2) using BETWEEN clause looks more natural here. I suggest you use TREE index (default index type) not HASH.

What is a datetime value?

The DateTime value type represents dates and times with values ranging from 00:00:00 (midnight), January 1, 0001 Anno Domini (Common Era) through 11:59:59 P.M., December 31, 9999 A.D. (C.E.) in the Gregorian calendar. Time values are measured in 100-nanosecond units called ticks.

How do you write datetime?

DateTime Properties

  1. DateTime myDate = new DateTime(2015, 12, 25, 10, 30, 45);
  2. int year = myDate.Year; // 2015.
  3. int month = myDate.Month; //12.
  4. int day = myDate.Day; // 25.
  5. int hour = myDate.Hour; // 10.
  6. int minute = myDate.Minute; // 30.
  7. int second = myDate.Second; // 45.

What is data type for date in SQL?

Date and Time data types

Data type Format Range
date YYYY-MM-DD 0001-01-01 through 9999-12-31
smalldatetime YYYY-MM-DD hh:mm:ss 1900-01-01 through 2079-06-06
datetime YYYY-MM-DD hh:mm:ss[.nnn] 1753-01-01 through 9999-12-31
datetime2 YYYY-MM-DD hh:mm:ss[.nnnnnnn] 0001-01-01 00:00:00.0000000 through 9999-12-31 23:59:59.9999999