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42 Trapping Rain Water
42 Trapping Rain Water链接:https://leetcode.com/problems/trapping-rain-water/ 问题描述: Given n non-negative integers representing an elevation map where the width of each bar is 1, compute how much water...
分类:移动开发   时间:2015-07-11 09:09:39    阅读次数:152
错误代码: 1242 Subquery returns more than 1 row
1. 错误描述1 queries executed, 0 success, 1 errors, 0 warnings查询:SELECT t.id, DATE_FORMAT( t.statisTime, '%Y-%m-%d %H:%i:%s' ) statisTime, (SELECT `id` FROM t_truck_info WHERE id = t.plateId...错误代码: 1242 S...
分类:其他好文   时间:2015-07-10 23:47:23    阅读次数:425
写sql语句连接的时候注意的一个小细节
我在写权限的查询的时候,用到了sql语句的链接写一下出错的时候的代码 $sqlpid="select auth_name from sw_auth where auth_level=0"; if(session('mg_id')!=5){ $sqlpid.="and auth...
分类:数据库   时间:2015-07-10 20:45:40    阅读次数:135
Oracle 11g Pivot函数实现行转列
先上语法规范:SELECT ....FROM PIVOT ( aggregate-function() FOR IN (, ,..., ) ) AS WHERE .....通过一个例子说明其用法:select * from (select salar...
分类:数据库   时间:2015-07-10 20:37:21    阅读次数:286
[leedcode 42] Trapping Rain Water
Givennnon-negative integers representing an elevation map where the width of each bar is 1, compute how much water it is able to trap after raining.Fo...
分类:移动开发   时间:2015-07-10 20:28:55    阅读次数:141
多个值以,分隔存储在一个字段精确匹配查询 sql语句
select * from tablename where charindex(‘,‘+‘3‘+‘,‘,‘,‘+name+‘,‘)>0
分类:数据库   时间:2015-07-10 19:25:15    阅读次数:251
没有密码直接进入mysql
mysql -u root输入以上可以直接进入这时候可以修改密码use mysql;mysql>update user set password=passworD("test") where user='root';mysql>flush privileges;mysql>exit; 此时密码已修....
分类:数据库   时间:2015-07-10 18:58:15    阅读次数:157
SQL 判断时间条件
1.判断年月日是否相等select * from table where cast(convert(varchar(10), 时间字段, 120) as datetime)='2010-10-01'判断逻辑:通过convert函数现将时间字段中年月日截取出来,然后利用cast函数转化为datetim...
分类:数据库   时间:2015-07-10 18:37:54    阅读次数:389
在SQLite中如何用一个表的字段更新另一个表
SQL语句:update table_1 set x = (select x from table_2 where table_1.y = table_2.y);如果括号中临时建立的表中元素的个数小于table_1中元素个数或者只想更新table_1中部分x的值,可以在后面加where子句.Exa....
分类:数据库   时间:2015-07-10 16:33:43    阅读次数:184
1042. Shuffling Machine (20) - sstream实现数字转字符串
题目如下: Shuffling is a procedure used to randomize a deck of playing cards. Because standard shuffling techniques are seen as weak, and in order to avoid "inside jobs" where employees collaborate w...
分类:系统相关   时间:2015-07-10 15:14:21    阅读次数:176
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