Can mysql column names have spaces

In MySQL, column names cannot contain spaces. Because spaces can cause parsing ambiguity and reduce query efficiency, the database becomes fragile. To avoid this problem, you can use underscore (_) or camel nomenclature (such as firstName) instead of spaces. Underline nomenclature is recommended because it is concise and in line with database naming habits.

Can MySQL column names have spaces? cannot. It's as ridiculous as if you're trying to split a word in half with a space and then expect it to remain true. This is not how the database system works.

You may wonder, why not? This limitation seems quite annoying. In fact, behind this is the consideration of underlying database design and specification. Imagine how you have to deal with SQL statements if spaces are allowed? How to distinguish column names from strings in parser? This will bring countless ambiguity and parsing errors, making the database extremely fragile and query efficiency will plummet. Just imagine how a headache-inducing nightmare you can be when debugging with spaces. It was simply a disaster.

Of course, you can save the country in a straight line. You can use _ instead of spaces, or simply use camel nomenclature (for example: firstName). Both methods can effectively avoid problems caused by spaces and keep the code readable. I personally prefer underscore because it is more concise and more in line with the naming habits of databases. The Camel nomenclature is also very useful in some cases, but underscores are better in database environments.

Let's look at some code examples and experience the elegance of underscore nomenclature:

<code class="sql">CREATE TABLE users ( user_id INT PRIMARY KEY, first_name VARCHAR(255), last_name VARCHAR(255), email VARCHAR(255) UNIQUE ); SELECT * FROM users WHERE first_name = 'John';</code>

This code is clear and easy to understand and has no ambiguity. And if we try to use spaces:

<code class="sql">-- 这段代码会报错！ CREATE TABLE users ( user id INT PRIMARY KEY, -- 错误！ first name VARCHAR(255), -- 错误！ last name VARCHAR(255), -- 错误！ email VARCHAR(255) UNIQUE );</code>

See? The compiler directly reports an error to you. This is not a minor problem, it will directly cause your database creation to fail. So, stop trying to challenge the bottom line of the database.

Remember, good database design lies not only in the implementation of functions, but also in the maintainability and readability of the code. Choosing the right naming specification will help you avoid many detours in future development and maintenance and avoid unnecessary trouble. Trust me, it's definitely worth it. Don't turn your database project into a difficult mess to maintain because of a momentary negligence. Choose underscore or camel nomenclature, which are all trustworthy choices. Avoiding spaces is not only a norm, but also a long-term stability for your project.

The above is the detailed content of Can mysql column names have spaces. For more information, please follow other related articles on the PHP Chinese website!