select LENGTH(type) - LENGTH(replace(type,'_','')) as counts from sa_log_olap where type like 'XX_XXXX_%' CASE WHEN LENGTH(type) - LENGTH(replace(type,'_',''))=2 THEN 'parent' WHEN LENGTH(type) - LENGTH(replace(type,'_',''))=3 and SUBSTRING_INDEX(rep
第一种:直接使用SQL语句,这种方式可以避免并发操作造成的数据不一致问题UPDATE 表名称 SET 列名称 = 列名称 + 1 WHERE …… 第二种:将上面的语句逻辑封装成一个存储过程,加上事务处理,达到互斥的目的,并且由代码调用存储过程完成. UPDATE T SET A = CASE WHEN A IS NULL THEN 0 ELSE A + 1 END; update dj_wlkc SET 浏览次数= CASE WHEN 浏览次数 IS NULL and 课程编号='*****
数据库环境:SQL SERVER 2008R2 有网友希望有人帮他优化一下他的SQL,SQL语句如下: WITH T AS ( SELECT B.O_Money MON,B.O_States STATES FROM M_Basket A JOIN M_OrderInfo B ON A.OrderID=B.ID WHERE A.GoodID=@GOODSID ), B AS ( SELECT (SELECT SUM(MON) FROM T)SumMoney, (,,))ComfirmMoney,
语法: CASE WHEN 条件1 THEN 结果1 WHEN 条件2 THEN 结果2 ...ELSE 其他结果 END 执行顺序: 条件1成立执行结果1 条件2成立执行结果2 如果所有WHEN的条件都不成立,则执行ELSE中的结果. 说明:ELSE可省略,如果省略ELSE并且WHEN的表达式的都不为TRUE, 那么ELSE返回NULL. 使用ABCDE打分制给学生打分: --A级:90分以上 --B级:80分以上 --C级:70分以上 --D级:60分以上 --E级:60分以下 DE
后缀数组的论文里的例题,论文里的题解并没有看懂,,, 求一个重复次数最多的连续重复子串,又因为要找最靠前的,所以扫的时候记录最大的重复次数为$ans$,扫完后再后从头暴力扫到尾找重复次数为$ans$的第一个子串的开头,break输出就可以了 #include<cmath> #include<cstdio> #include<cstring> #include<algorithm> using namespace std; const int N = 1000
Life Forms Time Limit: 5000MS Memory Limit: 65536K Total Submissions: 13063 Accepted: 3670 Description You may have wondered why most extraterrestrial life forms resemble humans, differing by superficial traits such as height, colour, wrinkles, e
if语法 : if [ expression ] then commandselif [ expression2 ] then commandselse commandsfi case 语法: case string1 in str1) commands;; str2) commands;; *) commans;;esac 循环语句 for 语法: for var in list do comm
Stars in Your Window Time Limit: 1000MS Memory Limit: 65536K Total Submissions: 10806 Accepted: 2980 Description Fleeting time does not blur my memory of you. Can it really be 4 years since I first saw you? I still remember, vividly, on the beaut
Problem Description In the year 8888, the Earth is ruled by the PPF Empire . As the population growing , PPF needs to find more land for the newborns . Finally , PPF decides to attack Kscinow who ruling the Mars . Here the problem comes! How can the