01由不等概率转变为等概率：
package Random.随机函数;
/**
* 不等概率的01----->等概率01
*/
public class Test2 {
public static int x(){
return Math.random() < 0.84? 0 : 1;
}
/**
* 等概率的01 先判断一次，ans要是是0，在判断一次，要是还是0，返回0，要是1就重来一次，同理1也这样，01就是等概率
* @return
*/
public static int y(){
int ans = 0;
do {
ans = x();
}while (ans==x());
return ans;
}
}
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MYSQL
这个题是三个表，我们的思维就是化成两个表，将其中两个表通过内连接合并，然后再和第一个表左连接查询
SELECT e.last_name, e.first_name, b.dept_name
FROM employees AS e
LEFT JOIN (SELECT d.dept_no,d.dept_name,de.emp_no
FROM departments AS d
INNER JOIN dept_emp AS de
ON d.dept_no=de.dept_no
) AS b
ON e.emp_no=b.emp_no;
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