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Which of the following characters is illegal in naming an unquoted identifier in SQL?

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Which of the following characters is illegal in naming an unquoted identifier in SQL?

(a) _

(b) $

(c) 2

(d) .

This question was addressed to me by my school principal while I was bunking the class.

My doubt stems from MySQL Identifier Syntax and Naming Rules topic in portion Using SQL to Manage Data of MySQL

1 Answer

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Best answer
The correct choice is (d) .

Explanation: An identifier is used to refer to a database or its elements. These elements can be entire tables or attributes. The names of these identifiers follow some set of rules, so they have a set of legal characters.

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