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【单选题】
EXHIBIT, Emp Table Exhibit A Exhibit B Examine the data from the EMP table. Evaluate this SQL statement: SELECT * FROM emp WHERE emp _ id = 3); WHERE commission = (SELECT commission FROM emp What is the result when the query is executed?（）A.
Exhibit A
B.
Exhibit B
C.
The query returns no rows
D.
The query fails because the outer query is retrieving more than one column
E.
The query fails because both the inner and outer queries are retrieving data from the same table.
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皮皮学刷刷变学霸
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【简答题】散光是指平行光线经过眼球屈光系统折射后，并不聚为单一点，而是散开的许多光像。结合角膜和晶状体的结构特点，分析散光形成原因。
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