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  1. Which of the following is an illegal unquoted identifier name?
    1. id1
    2. 123
    3. 123id
    4. 123_id
    5. None of these
Correct Option: D

In MySQL, the quoted and unquoted identifier names have differences in the level of restrictions imposed on them. An unquoted identifier name can’t have all digits since it would be impossible to distinguish it from an integer constant.


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