Mysql没有直接的语法可以在增加列前进行判断该列是否存在,需要写一个存储过程完成同样任务,下面例子是:在sales_order表中增加一列has_sent列 drop procedure if exists schema_change; delimiter ';;'; create procedure schema_change() begin if exists (select * from information_schema.columns where table_name = 'sal
题目:有n个整数,使其前面各数顺序向后移n个位置,最后m个数变成最前面的m个数 public class _036ExchangeSite { public static void main(String[] args) { exchangeSite(); } private static void exchangeSite() { int N = 10; int[] a = new int[N]; Scanner scanner = new Scanner(System.in); System
题目:有n个整数,使其前面各数顺序向后移n-m个位置,最后m个数变成最前面的m个数 public class 第三十六题数组向后移m个位置 { public static void main(String[] args) { int[] a = new int[] { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13 }; int n = a.length; System.out.print("请输入向后移动的位数: "); Scanner in =
//有n个整数,使其前面各数顺序向后移m个位置,最后m个数变成最前面的m个数 import java.util.ArrayList; import java.util.Scanner; public class Test36 { public static void main(String[] args) { int n = getN(); int[] a = getNum(new int[n]); int m = getM(n); ArrayList<Integer> list = new
通过存储过程判断字段是否存在,不存在则增加: DROP PROCEDURE IF EXISTS pro_AddColumn; CREATE PROCEDURE pro_AddColumn() BEGIN FROM information_schema.columns WHERE table_name='component' AND COLUMN_NAME='PRINT_CHECK_STATUS') THEN ) ; END IF; FROM information_schema.columns
DECLARE numbe NUMBER;BEGIN SELECT COUNT(1) INTO numbe FROM USER_TABLES WHERE TABLE_NAME = UPPER('TTT'); IF numbe > 0 THEN EXECUTE IMMEDIATE 'DROP TABLE ' || 'TTT'; END IF;END;
题目难度:Medium 题目: Given an array S of n integers, find three integers in S such that the sum is closest to a given number, target. Return the sum of the three integers. You may assume that each input would have exactly one solution. 翻译: 给定一个n个整数的数组S,在S
