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若要将学生张三所在的系从“计算机系”改为“信息系”正确的语句是()
A.UPDATE Student SET sdept ='计算机系’ WHHERE Sname='张三' AND sdept='信息系’
B.UPDATE Student SET sdept = '计算机系' WHERE Sname='张三'
C.UPDATE Student SET sdept = '信息系' WHERE Sname='张三' AND sdept='计算机系'
D.UPDATE Student SE T sdept ='信息系' WHERE Sname='张三'
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