取一段连续时间SELECT DISTINCT CONVERT(VARCHAR(7), DATEADD(month, -number, CONVERT(VARCHAR(11), GETDATE(), 120)), 120) AS NewDateFROM mas...
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数据库 时间:
2014-11-01 13:22:29
阅读次数:
188
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)...
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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
select distinct TABLE_COLUMN.*,
TABLE_NALLABLE.DATA_TYPE,
TABLE_NALLABLE.NULLABLE
from (select distinct utc.table_name ta...
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数据库 时间:
2014-10-31 11:58:09
阅读次数:
163
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...
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数据库 时间:
2014-10-30 20:57:44
阅读次数:
249
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...
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其他好文 时间:
2014-10-30 07:06:13
阅读次数:
171
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...
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其他好文 时间:
2014-10-30 00:24:42
阅读次数:
202
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...
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其他好文 时间:
2014-10-29 22:21:11
阅读次数:
175
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...
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其他好文 时间:
2014-10-29 12:48:28
阅读次数:
170
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.....
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其他好文 时间:
2014-10-29 10:27:54
阅读次数:
117
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.
...
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其他好文 时间:
2014-10-28 20:03:53
阅读次数:
245