Assume the user has just connected to the MySQL server.What is the result of the query SELECT @ a?

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answerhappygod
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Assume the user has just connected to the MySQL server.What is the result of the query SELECT @ a?

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Assume the user has just connected to the MySQL server.What is the result of the query SELECT @ a?

A. An error that @ a is undefined
B. A single NULL
C. An empty string
D. The value of GLOBAL variable @ a
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