百度试题 结果1 题目SELECT SUBSTRING_INDEX(‘Welcome to China’, ‘to’, -1)的结果是( ) A. Welcome B. to C. China D. Welcome to 相关知识点: 试题来源: 解析 C China 反馈 收藏
select * from lackgoodsapplybillbase a inner join lackgoodsapplybillinfo b on a.`vLACKGOODSAPPLY_ID`=b.`vLACKGOODSAPPLY_ID` where b.`vPART_ID` not in (select SUBSTRING_INDEX(vPART_ID, '/', 1) from materbaseinfo) order by a.dOPERATE_DATE DESC...
select substring_index(profile,',',-1) as gender, count(device_id) from user_submit group by gender; 先拿substring_index将性别分出来,再计算每个性别对应的设备账号,再用性别分组就ok_牛客网_牛客在手,offer不愁
select * from lackgoodsapplybillbase a inner join lackgoodsapplybillinfo b on a.`vLACKGOODSAPPLY_ID`=b.`vLACKGOODSAPPLY_ID` where b.`vPART_ID` not in (select SUBSTRING_INDEX(vPART_ID, '/', 1) from materbaseinfo) order by a.dOPERATE_DATE DESC...
select substring_index(subject_set,',',1) as subject_id1, count(distinct id) as cnt from comment_detail where subject_set regexp'^1002|,1002' group by subject_id1 order by subject_id1 05-06 11:50 北京邮电大学 移动通讯工程师
SUBSTRING_INDEX(str,delim,count) 1. str是待处理的字符串 delim是分隔符 count是整数,表示要返回的部分,正数表示从左往右返回,负数则从右往左。 示例 假设我们有一个users表,其中包含user_info字段,存储了类似"Alice,24,Female"的信息。以下是如何使用SUBSTRING_INDEX来分割这些信息的示例: ...
我们注意到在函数 substring(str,pos, len)中, pos 可以是负值,但 len 不能取负值。 4. 字符串截取:substring_index(str,delim,count) 4.1 截取第二个'.' 之前的所有字符。 mysql> select substring_index('www.sqlstudy.com.cn','.',2);
SELECT CONCAT(SUBSTRING_INDEX('DI00-1-380216','-',1),SUBSTRING_INDEX('DI00-1-380216','-',-1)) But I have this output: DI00380216 Can u help me? Thanks in advance Subject Written By Posted Select CONCAT and SUBSTRING_INDEX angel rivero ...
select count(distinct email) / count(*) from tb_user; select count(distinct substring(email, 1, 5)) / count(*) from tb_user; show index 里面的sub_part可以看到接取的长度 mysql> create index idx_tb_user_email_4 on tb_user(email(4)); Query OK, 0 rows affected (0.16 sec) Records...
Re: Select CONCAT and SUBSTRING_INDEX laptop alias June 13, 2011 06:16AM Re: Select CONCAT and SUBSTRING_INDEX Hari sankar A June 13, 2011 06:36AM Re: Select CONCAT and SUBSTRING_INDEX angel rivero June 13, 2011 07:32AM Sorry, you can't reply to this topic. It has been closed....