How to use integer in oracle

The INTEGER data type in Oracle is used to store integers between -2,147,483,648 and 2,147,483,647. Mainly used to store integer identifiers, counters and status flags. It should be noted that this data type cannot store decimals or negative numbers, and the storage space is fixed.

Usage of INTEGER data type in Oracle

INTEGER is the data type used in Oracle to store integers. It can store integers between -2,147,483,648 and 2,147,483,647.

Syntax

INTEGER [precision]

Where:

• precision is optional, specifying the number of digits stored in INTEGER. Range is 1 to 38. Defaults to 32-bit if not specified.

Usage

INTEGER data type is mainly used to store integers, for example:

• Identifier (such as customer ID)
• Counter (e.g. order quantity)
• Status flag (e.g. activated/deactivated)

Things to note

• INTEGER cannot store decimals or negative numbers.
• The storage space of INTEGER is fixed, so it is not suitable for storing numbers that may grow to very large sizes.
• If the number stored in INTEGER exceeds its range, an overflow or underflow error occurs.

Example

-- 创建一个名为 "customer_id" 的 INTEGER 列
CREATE TABLE customers (
  customer_id INTEGER NOT NULL
);

-- 插入一个数字到 "customer_id" 列
INSERT INTO customers (customer_id) VALUES (12345);

-- 检索 "customer_id" 列中的数字
SELECT customer_id FROM customers;

Output:

12345

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