How to set the character size to 10 digits for reserved integers in Oracle

The character size of numeric fields in Oracle can be set by NUMBER (character size, precision), where the precision of an integer is 0. For numeric fields that need to store 10-digit integers, you can follow the steps below: 1. Create a table and set the character size of the numeric field to 10; 2. Insert 10-digit integer data; 3. Verify that the character size is correctly set to 10 digits.

How to set the character size of numeric fields in Oracle to 10 digits

In Oracle, you can set the numeric fields character size to control the maximum value it can store. For numeric fields that need to store 10-digit integers, you can use the following steps to set them up:

1. Create table

<code class="sql">CREATE TABLE employee (
    id NUMBER(10, 0) PRIMARY KEY,
    name VARCHAR2(255)
);</code>

NUMBER(10, 0)# The ## part specifies that the character size of the numeric field is 10 bits and the precision is 0 (that is, an integer).

2. Insert data

<code class="sql">-- 插入 10 位整数 1234567890
INSERT INTO employee (id, name) VALUES (1234567890, 'John Doe');</code>

3. Verify character size

<code class="sql">SELECT DATA_LENGTH(id) FROM employee WHERE id = 1234567890;</code>

The query result will display

10, indicating that the character size of the field has been correctly set to 10 bits.

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