题目:将student表按照gender字段值进行分组查询,并计算出每个分组中各有多少名学生的正确SQL语句是:
A. SELECT TOTAL (*), gender FROM student GROUP BY gender;
B. SELECT COUNT (*), gender FROM student GROUP BY gender;
C. SELECT TOTAL (*), gender FROM student ORDER BY gender;
D. SELECT COUNT (*), gender FROM student ORDER BY gender;
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