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Java for LeetCode 073 Set Matrix Zeroes
Given a m x n matrix, if an element is 0, set its entire row and column to 0. Do it in place.解题思路:用两个boolean数组row col表示行列是否有零即可,JAVA实现如下: public void ...
分类:编程语言   时间:2015-05-17 10:38:44    阅读次数:179
sql学习笔记(13)-----------sql函数总结
SQL AVG 函数   定义和用法 AVG 函数返回数值列的平均值。NULL 值不包括在计算中。 SQL AVG() 语法 SELECT AVG(column_name) FROM table_name SQL AVG() 实例 我们拥有下面这个 "Orders" 表: O_Id OrderDate OrderPrice Customer ...
分类:数据库   时间:2015-05-17 09:23:33    阅读次数:171
mysql 索引
mysql包含主键索引,普通索引,唯一索引,联合索引;一、索引 1、创建索引:(1)ALTER TABLEALTER TABLE用来创建普通索引、UNIQUE索引或PRIMARY KEY索引。ALTER TABLE table_name ADD INDEX index_name (column_li...
分类:数据库   时间:2015-05-16 21:45:40    阅读次数:222
[LeetCode][JavaScript]Excel Sheet Column Number
Related to questionExcel Sheet Column TitleGiven a column title as appear in an Excel sheet, return its corresponding column number.For example: A ...
分类:编程语言   时间:2015-05-16 18:13:39    阅读次数:266
[LeetCode][SQL]Combine Two Tables
https://leetcode.com/problems/combine-two-tables/Combine Two TablesTable:Person+-------------+---------+| Column Name | Type |+-------------+------...
分类:数据库   时间:2015-05-16 17:51:29    阅读次数:166
[LeetCode][JavaScript]Excel Sheet Column Title
https://leetcode.com/problems/excel-sheet-column-title/Given a positive integer, return its corresponding column title as appear in an Excel sheet.For...
分类:编程语言   时间:2015-05-16 17:45:26    阅读次数:117
mysql alter example
alter table `user_movement_log` Add column GatewayId int not null default 0 AFTER `Regionid` (在哪个字段后面添加) alter table x_connection add `FEX-N752` varch...
分类:数据库   时间:2015-05-16 16:24:04    阅读次数:200
css笔记-display属性
css笔记-display属性 display属性可取值 display:none | inline | block | list-item | inline-block | table | inline-table | table-caption | table-cell | table-row | table-row-group | table-column | table-colu...
分类:Web程序   时间:2015-05-16 12:00:26    阅读次数:117
mysql modify column
alter table yourtable modify column yourcolumn varchar( 2000 );
分类:数据库   时间:2015-05-16 00:08:09    阅读次数:131
Column 'id' in where clause is ambiguous
1、错误描述 org.hibernate.exception.ConstraintViolationException: error executing work at org.hibernate.exception.internal.SQLExceptionTypeDelegate.convert(SQLExceptionTypeDelegate.java:72) at org.hiber...
分类:其他好文   时间:2015-05-15 22:52:01    阅读次数:891
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