错误代码: DELETE FROMpayment WHEREserial IN ( SELECT serial FROM payment GROUP BY serial HAVING count(*) > 1 ) AND id NOT IN ( SELECT min( id ) AS id FROM payment GROUP BY serial HAVING count( serial )
实现2/1 3/2 5/3 8/5 13/8...前20项的和public class Test {public double sum(){double m = 1; //分母double n = 2;//分子double sum = 0;for (int i = 0; i < 20; i++) {sum = sum+n/m;double temp = m;m = n;n = m + temp;
题目 希望这些选择题能够帮助您进行前端面试的准备,答案在文末。 1. 在JavaScript中,以下哪个关键字用于声明一个变量? a) letb) varc) constd) all of the above 2. 下面哪个方法可以用于将一个字符串转换为整数? a) toInteger()b) parseInt()c) convertToInt()d) toNumber()