DELETE是一个蛮慎重的SQL操作,一般来说这样删除操作都需要谨慎小心,以免造成不必要的损失。
DELETE有下面这几种情况:
Ø delete
from t1 where 条件
Ø delete
t1 from t1 where 条件
Ø delete
t1 from t1,t2 where 条件
Ø delete
t1,t2 from t...
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数据库 时间:
2015-07-11 18:35:39
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216
/*
Experiment to find out what happens when printf's argument string contains \c, where c is some character not listed above.
*/
#include
main()
{
printf("hello world\y");
printf("hello wor...
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其他好文 时间:
2015-07-11 18:27:26
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137
有时候查询数据库的时候会发现(比如做重名检查的时候):数据库的查询时对大小写不敏感的,也就是 A 和 a 是一样的。 也就是说 select * from tabletest where name = 'a' 和 select * from tabletest where name = 'A' 两条...
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数据库 时间:
2015-07-11 18:10:19
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159
Trapping Rain Water
Given n non-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.
For example,
Given [0...
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移动开发 时间:
2015-07-11 15:10:33
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164
1、??Convert Sorted List to Binary Search TreeGiven a singly linked list where elements are sorted in ascending order, convert it to a height balanced ...
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其他好文 时间:
2015-07-11 14:49:51
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100
Air RaidTime Limit:1000MSMemory Limit:10000KTotal Submissions:7278Accepted:4318DescriptionConsider a town where all the streets are one-way and each s...
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其他好文 时间:
2015-07-11 13:29:49
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91
小标记一下,数据库大量重复数据去除下面是一个根据重复的name 移除的create table temp select max(id) as id from table1 group by name ;//name分组 拿到最大id 保存到临时表delete table1 where id not ...
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数据库 时间:
2015-07-11 13:27:06
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158
题目连接http://acm.hdu.edu.cn/showproblem.php?pid=3342Legal or NotDescriptionACM-DIY is a large QQ group where many excellent acmers get together. It is s...
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其他好文 时间:
2015-07-11 11:56:26
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250
传统的sql与ThinkPHP中的sql相比较 以user表为例 $user=M('user');1: SELECT * FROM user----------$user->select();2: SELECT* FORM user WHERE id=2----...
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数据库 时间:
2015-07-11 11:50:07
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159
1.MySQL修改root密码mysql> UPDATE user SET Password=PASSWORD('xxxx') where USER='root'; mysql> FLUSH PRIVILEGES; mysql> quit把PASSWORD('xxxx')中xxxx替换为你自己的.....
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数据库 时间:
2015-07-11 10:27:22
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172