Create a Table with Autonumbering

Question:
I’ve tried to create a table (for my guestbook) with an auto increment column. Here’s my statement:

CREATE TABLE guestbook(id mediumint(8) NOT NULL KEY(PRI) default(0) auto_increment, name varchar(30) NOT NULL,email varchar(30) NOT NULL,comments text NOT NULL);

Why doesn’t it work?

Answer:
If you’re using SQL Server, you need to make minor changes to your create table statement in order to create the guestbook table:

  1. The id column should be specified as int with no size. There’s no medium int data type in SQL Server. The int data type allows values up to 2,147,483,647. You could use the smallint data type allowing values up to 32,767, but it’s worth the extra two bytes not to worry about outgrowing the column.
  2. You gain the auto_increment capability by using the IDENTITY attribute on a column. This attribute increments the column value each time a record is inserted. The syntax is:
    IDENTITY  

    You can provide a starting value and a value to increment by—the default is 1,1 if none are specified.

  3. The primary key constraint must be defined with the keywords “PRIMARY KEY.”

The modified statement looks like this:

CREATE TABLE guestbook(id int NOT NULL IDENTITY (1,1) PRIMARY KEY, name varchar(30) NOT NULL,email varchar(30) NOT NULL,comments text NOT NULL);

Share the Post:
Share on facebook
Share on twitter
Share on linkedin

Overview

The Latest

technology leadership

Why the World Needs More Technology Leadership

As a fact, technology has touched every single aspect of our lives. And there are some technology giants in today’s world which have been frequently opined to have a strong influence on recent overall technological influence. Moreover, those tech giants have popular technology leaders leading the companies toward achieving greatness.

iOS app development

The Future of iOS App Development: Trends to Watch

When it launched in 2008, the Apple App Store only had 500 apps available. By the first quarter of 2022, the store had about 2.18 million iOS-exclusive apps. Average monthly app releases for the platform reached 34,000 in the first half of 2022, indicating rapid growth in iOS app development.

microsoft careers

Top Careers at Microsoft

Microsoft has gained its position as one of the top companies in the world, and Microsoft careers are flourishing. This multinational company is efficiently developing popular software and computers with other consumer electronics. It is a dream come true for so many people to acquire a high paid, high-prestige job