How to use interval in oracle

The INTERVAL data type in Oracle is used to represent time intervals. The syntax is INTERVAL . You can use addition, subtraction, multiplication and division operations to operate INTERVAL, which is suitable for storing time data and calculating date differences. Worth waiting for the scene.

Usage of INTERVAL in Oracle

In Oracle, the INTERVAL data type is used to represent time intervals. It's great for storing and manipulating time data.

Syntax for INTERVAL

INTERVAL <精度> <单位>
         

        

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Where:

• Precisionis the number of decimal places for the INTERVAL value.

• UnitSpecify the unit of the time interval, which can be:

  • YEAR: year
  • MONTH: month
  • DAY：Day
  • HOUR：Hour
  • MINUTE：Minute
  • SECOND：Second
  • YEAR TO MONTH：Year to month
  • DAY TO HOUR：Day to minute
  • DAY TO MINUTE：Day to minute
  • DAY TO SECOND：Day to second

Create INTERVAL

You can create INTERVAL using the following syntax:

CAST(<值> AS INTERVAL <单位>)

For example:

CAST('1' AS INTERVAL YEAR) -- 创建一个间隔 1 年的值 CAST('-2' AS INTERVAL MONTH) -- 创建一个间隔 2 个月的负值

Operation INTERVAL

INTERVAL can be operated on using arithmetic operators:

• Addition ( ): Increase the time interval.
• Subtraction (-): Reduce the time interval.
• Multiplication (*): Multiply the time interval by a number.
• Division (/): Divide the time interval by a number.

For example:

INTERVAL '1' YEAR + INTERVAL '3' MONTH -- 增加一个时间间隔，间隔为 1 年 3 个月 INTERVAL '2' DAY - INTERVAL '1' DAY -- 减小一个时间间隔，间隔为 1 天 3 * INTERVAL '1' HOUR -- 将时间间隔乘以 3，间隔为 3 小时 INTERVAL '1' DAY / 2 -- 将时间间隔除以 2，间隔为 12 小时

USE INTERVAL

INTERVAL can be used for many purposes, including:

• Storage and operating time data.
• Calculate the difference between date and time.
• Create time-based triggers or constraints.

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