题目:用户表user中存在一个名字字段username,现查询名字字段中包含"凤"的用户,下列SQL语句中,正确的是:
A. select * from user where username = '凤';
B. select * from user where username like '%凤%';
C. select * from user where username like '_凤_';
D. select * from user where username like '凤';
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