SQL Keywords: Uppercase or Lowercase—Does it Really Matter?

Why Use Upper Case for SQL Keywords?

The default convention for SQL keywords is uppercase. However, some developers prefer to use lowercase for readability. Is there any compelling reason to adhere to the uppercase convention?

Answer:

No, there is no logical reason to use uppercase for SQL keywords. Case is not significant in SQL, and using lowercase does not affect the functionality of queries.

Personal Preference:

Ultimately, the choice of whether to use upper or lowercase is a matter of personal preference. Some developers argue that uppercase keywords make code easier to distinguish from table and column names. Others believe that lowercase keywords enhance readability and reduce finger strain.

Readable Code:

The respondent prefers lowercase keywords because they find it easier to read. Lowercase letters are less imposing and make literals and comments stand out. For example, the following lowercase query is easier on the eyes than its uppercase counterpart:

select * from customers where name like '%smith%';

Avoiding CAPS LOCK:

The respondent also expresses distaste for using CAPS LOCK, which is a necessary evil when typing uppercase keywords. CAPS LOCK can be distracting and error-prone.

Conclusion:

While the default for SQL keywords is uppercase, there is no technical advantage to using it. Developers are free to choose the case that best suits their reading and coding preferences.

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