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检索职工表中年龄大于50的职工姓名,正确的命令是( )。

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SELECT 姓名,城市 FROM 职工; WHERE (年龄>50) OR (职工.职工号=城市.职工号)  SELECT 姓名,城市 FROM职; WHERE(年龄>50)AND(职工.职工号=城市.职工号)  SELECT 姓名,城市FROM城市,职工; WHERE(年龄>50)OR(职工.职工号=城市.职工号)  SELECT 姓名,城市 FROM 城市,职工; WHERE(年龄>50)AND(职工.职工号=城市.职工号)  
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SELECT 姓名,城市 FROM 职工:WHERE (年龄>50)OR(职工.职工号=城市.职工号)  SELECT 姓名,城市 FROM 职工;WHERE(年龄>50)AND(职工.职工号=城市.职工号)  SELECT 姓名,城市 FROM 城市,职工;WHERE(年龄>50)OR (职工.职工号=城市.职工号)  SELECT 姓名,城市 FROM 城市,职工;WHERE(年龄>50)AND (职工.职工号=城市.职工号)  
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SELECT 姓名,城市 FROM 职工;
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SELECT 姓名,城市 FROM 职工; WHERE(年龄>50) OR (职工.职工号=城市.职工号)  SELECT 姓名,城市 FROM 职工; WHERE(年龄>50) AND (职工.职工号=城市.职工号)  SELECT 姓名,城市 FROM 城市,职工; WHERE(年龄>50) OR (职工.职工号=城市.职工号)  SELECT姓名,城市 FROM 城市,职工; WHERE(年龄>50) AND (职工.职工号;城市,职工号)  
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SELECT 姓名,城市 FROM 职工;

WHERE (年龄>50) OR (职工.职工号=城市.职工号)  
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SELECT 姓名,城市 FROM 职工; WHERE (年龄>50) OR (职工.职工号=城市.职工号)  SELECT 姓名,城市 FROM 职工; WHERE (年龄>50) AND (职工.职工号=城市.职工号)  SELECT 姓名,城市 FROM 城市,职工; WHERE (年龄>50) OR (职工.职工号=城市.职工号)  SELECT 姓名,城市 FROM 城市,职工; WHERE (年龄>50) AND (职工.职工号=城市.职工号)  
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