Examine the data of the EMPLOYEES table. EMPLOYEES (EMPLOYEE_ID is the primary key. MGR_ID is the ID of managers and refers to the EMPLOYEE_ID) <img src="/Image1/90/904658da30f762909b717cd736e0e180.jpg" /> Evaluate this SQL statement: <img src="/Image1/47/47a1d15de62e841678587793a8580109.jpg" /> What is its output?（） A:<img src="/Image1/cc/cc7070a0f2b10cc39e15857a1056e1c8.jpg" /> B:<img src="/Image1/71/7197b0d47c7c3b7c5ab56ed741eb2ca0.jpg" /> C:<img src="/Image1/b7/b71d22952f5dbe59a405ad36ee0d3ac3.jpg" /> D:<img src="/Image1/66/663bdd4f6e8c2ec35ad08fa35f143dcf.jpg" /> E: The SQL statement produces an error.

Examine the data of the EMPLOYEES table. EMPLOYEES (EMPLOYEE_ID is the primary key. MGR_ID is the ID of managers and refers to the EMPLOYEE_ID)

Evaluate this SQL statement:

What is its output?（）
A:

E: The SQL statement produces an error.

出自：Oracle认证

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