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SQl server master
取一段连续时间SELECT DISTINCT CONVERT(VARCHAR(7), DATEADD(month, -number, CONVERT(VARCHAR(11), GETDATE(), 120)), 120) AS NewDateFROM mas...
分类:数据库   时间:2014-11-01 13:22:29    阅读次数:188
去重查询某表中的信息,并删除另一表中的刚刚查出来的信息
select DISTINCT carnum from new_op_car_ownerdelete from new_op_car_owner where carnum in(select carnum from(select max(carnum) as carnum,count(carnum)...
分类:其他好文   时间:2014-10-31 19:01:13    阅读次数:159
oracle查看该用户的所有表名字、表注释、字段名、字段注释、是否为空、字段类型
--oracle查看该用户的所有表名字、表注释、字段名、字段注释、是否为空、字段类型 select distinct TABLE_COLUMN.*, TABLE_NALLABLE.DATA_TYPE, TABLE_NALLABLE.NULLABLE from (select distinct utc.table_name ta...
分类:数据库   时间:2014-10-31 11:58:09    阅读次数:163
ORACLE数据库操作简便函数用法
1、DISTINCT用法:          SELECT   DISTINCT    A.NAME  ,  A.STUDENT_ID  ,  A.SEX   FROM TABLE STUDENT            这条SQL语句是从学生表里查询了姓名,学号,性别,但是DISTINCT的查询规则是只要有一个不同,就是符合条件的。         例: 源数据...
分类:数据库   时间:2014-10-30 20:57:44    阅读次数:249
[Leetcode] Distinct Subsequences
Given a stringSand a stringT, count the number of distinct subsequences ofTinS.A subsequence of a string is a new string which is formed from the orig...
分类:其他好文   时间:2014-10-30 07:06:13    阅读次数:171
LeetCode Climbing Stairs
You are climbing a stair case. It takes n steps to reach to the top. Each time you can either climb 1 or 2 steps. In how many distinct ways can you climb to the top? 每一次你可以爬一层或者两层,计算爬n层你...
分类:其他好文   时间:2014-10-30 00:24:42    阅读次数:202
Climbing Stairs
You are climbing a stair case. It takes n steps to reach to the top. Each time you can either climb 1 or 2 steps. In how many distinct ways can you climb to the top? 简单递推 class Solution { pub...
分类:其他好文   时间:2014-10-29 22:21:11    阅读次数:175
Climbing Stairs 爬楼梯问题,每次可以走1或2步,爬上n层楼梯总方法 (变相fibnacci)
You are climbing a stair case. It takesnsteps to reach to the top.Each time you can either climb 1 or 2 steps. In how many distinct ways can you climb...
分类:其他好文   时间:2014-10-29 12:48:28    阅读次数:170
Cardinality (基数)
名词Cardinality: 优化器在计算成本的时候,需要从统计信息中取得数据,然后去估计每一步操作所涉及的行数,叫做Cardinality。 比如,一张表T有1000行数据,列COL1上没有直方图,没有空值,并且不重复的值(distinct value)有500个。那么,在使用条件“WHERE.....
分类:其他好文   时间:2014-10-29 10:27:54    阅读次数:117
LeetCode--N-Queens
The n-queens puzzle is the problem of placing n queens on an n×n chessboard such that no two queens attack each other. Given an integer n, return all distinct solutions to the n-queens puzzle. ...
分类:其他好文   时间:2014-10-28 20:03:53    阅读次数:245
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