单项选择题

公司员工表的出生地字段里有空值,如果需要查询出非空出生地的员工,以下查询语句正确的是()

A.select name,birth_city from worker where birth_city< >""
B.select name,birth_city from worker where birth_city IS NOT NULL
C.select name,birth_city from worker where birth_city!=""
D.select name,birth_city from worker where birth_city=NOT_NULL

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