902 simulations

11210-chinese Mahjong Time limit:3.000 seconds http://uva.onlinejudge.org/index.php?option=onlinejudge&page=show_problem&problem=2151 Mahjong () is a game of Chinese origin usually played from four persons with tiles resembling dominoes and

The picture is omitted.This article transferred from: http://blog.sina.com.cn/s/blog_767d65530101861c.html1. Create Student and score tablesCREATE TABLE Student (ID INT (Ten) is not NULL UNIQUE PRIMARY KEY,Name VARCHAR () is not NULL,Sex VARCHAR (4),Birth year,Department VARCHAR (20),Address VARCHAR (50));Create a score table. The SQL code is as follows:CREATE TABLE Score (ID INT (Ten) is not NULL UNIQUE PRIMARY KEY auto_increment,stu_id INT (Ten) is not NULL,C_name VARCHAR (20),Grade INT (10));

:*:15980:0:99999:7:::d aemon:*:15980:0:99999:7:::SGID: Instance test three users can create a file directory in the same directory, and modify the file contents of each other[[emailprotected]~]$tail-5/etc/passwd# There are three users in the current system user1:x:500:500::/home/user1:/bin/bashhbase:x:501:501::/home/hbase:/bin/bashhadoop:x:502:502::/home/ hadoop:/bin/bash[[emailprotected]tmp]#mkdirproject Create a new directory in the #在 /tmp directory /project[[emailprotected]tmp]# groupadddev

1. Create Student and score tablesCREATE TABLE student (id INT(10) NOT NULL UNIQUE PRIMARY KEY ,name VARCHAR(20) NOT NULL ,sex VARCHAR(4) ,birth YEAR,department VARCHAR(20) ,address VARCHAR(50) );Create a score table. The SQL code is as follows:CREATE TABLE score (id INT(10) NOT NULL UNIQUE PRIMARY KEY AUTO_INCREMENT ,stu_id INT(10) NOT NULL ,c_name VARCHAR(20) ,grade INT(10));2. Adding records for student and score tablesInsert statement that inserts a record into the s

When I met one of the founders of the SimPy bag, Klaus Miller, I learned about the package from him. Dr. Miller has read several cute Python columns that suggest techniques for implementing semi-collaborative routines and "lightweight" threading using the Python 2.2+ generator. Especially (to my delight), he found that these techniques are useful when using Python to implement Simula-67 style simulations. The results showed that Tony Vignaux and Chan

chess player is simple, for the machine still have some difficulty, but this problem has been basically solved). For the chess player is to deduce chess. Alphago will simulate multiple times, "more than once." More and more simulations will make Alphago's deduction "Deeper" (1 steps in the beginning, it may be dozens of paces later, and the judgment of the current situation is "more and more accurate" (because she knows the result of the change in th

; SELECT Student.id,name,sex,birth,department,address,c_name,gradeFrom Student,scoreWHERE student.id=score.stu_id;+-----+--------+------+-------+------------+--------------+--------+-------+|ID |name |sex |Birth |Department |Address |C_name | Grade |+-----+--------+------+-------+------------+--------------+--------+-------+|901 |Boss Zhang |Male |1985 |Computer Systems |Haidian District, Beijing |Computer | 98 ||901 |Boss Zhang |Male |1985 |Computer Systems |Haidian District, Beijing |English |

To investigate the failure of Oracle, you can set up an event to learn more about the situation. Here's how:If you use SPFILE,=============To enable it:1. Check The current event setting status:Sql> show parameter event;2. Add an event and set it up:If there is the no existing event, it is set as follows:Sql> alter system set event = ' 235 errorstack (3) systemstate (Ten) ' scope = SPFile;If There is an existing event, add it and set it as follows:For example, if there was already an event of "

[Oracle] How to set event (eg:ora-00235) for a databaseWhen you use SPFILE,Setting procedure:1. Check The current event setting status:Sql> show parameter event;2. Add an event and set it up:If there is the no existing event, it is set as follows:Sql> alter system set event = ' 235 errorstack (3) systemstate (Ten) ' scope = SPFile;If There is an existing event, add it and set it as follows:For example, if there was already an event of "902 Errorstack

Rank () sorts data in a table hierarchically. For example, student_result Name number Kemu fenshu Li 0113101 High 90 Zhang 0113098 high 80 Wang 0113077 High 70 Li 0113101 physical 80 Zhang 0113098 physical 90 Wang 0113077 physical 70 If I want to retrieve the first two names in the table with a high number and the first two names in the physical tableYou can use the rank () method to achieve the goal. -- First sort by Kemu and then sort by fenshu in descending orderSelect rank () over (partitio

Rank () sorts data in a table hierarchically.For example, student_resultName number Kemu fenshuLi 0113101 High 90Zhang 0113098 high 80Wang 0113077 High 70Li 0113101 physical 80Zhang 0113098 physical 90Wang 0113077 physical 70 If I want to retrieve the first two names in the table with a high number and the first two names in the physical tableYou can use the rank () method to achieve the goal. -- First sort by Kemu and then sort by fenshu in descending orderSelect rank () over (partition by Kemu

SQL connections (internal, external, cross-connect)Suppose there are two tables: table1, table2Table1:table2:ID Name ID Score1 Lee 1 902 Zhang 2 1004 Wang 3 70Tables are connected to columns (properties), and two tables are connected by some rule to two tables, typically either by adding columns or by reducing the number of columns, asID Name ID Score1 Lee 1 902 Zhang 2 1001 ) Inner joins: Join or INNER JOI

When I met one of SimPy's founder Klaus Miller, I learned about the bag from him. Dr. Miller has read several lovely Python columns that suggest techniques for using Python 2.2+ generators to implement semi-collaborative routines and "lightweight" threading. In particular (which I am pleased with), he found these techniques useful when implementing Simula-67 style simulations in Python. The result is that Tony Vignaux and Chang Chui have previously c

Internal JOIN: INNERJOIN or JOIN, which finds the data corresponding to the two tables. Outer Join: OUTERJOIN. The corresponding data is retrieved based on a table and divided into left Outer Join and right outer join. Left Outer Join: LEFTJOIN or LEFTOUTERJOIN. The corresponding data is retrieved based on a table. RIGHT outer join: RIGHTJOIN or RIGHT Internal JOIN: inner join or JOIN to check the data corresponding to the two tables. Outer join: outer join, which identifies the corresponding da

1. Where and having The where clause search condition is applied before grouping, while the having search condition is applied after grouping. Therefore, a where clause is not followed by a gathering function (a function that calculates a column in a group of rows and returns a single value such as Count () sum ()). 2. exist and in In is a set operator, with a column name on the front. Exists is an existence judgment. If there is a result in the following query, exists is true; otherwise, it is

Internal join: inner join or join to check the data corresponding to the two tables. Outer Join: Outer Join, which identifies the corresponding data based on a table and is divided into left Outer Join and right outer join. Left Outer Join: left join or left Outer Join. The corresponding data is retrieved based on a table. Outer right join: Right join or right outer join. The corresponding data is retrieved based on a table. Full join: Full join, based on multiple tables Student tableNo name

Student tableNO Name12 B3 c4 dGrade tableNO Grade1 902 983 955 90Inner join: The data corresponding to the search condition. No data is listed in no4.Syntax: select * from student inner join grade on student. no = grade. noResult:NO Name NO Grade1 a 1 902 B 2 983 c 3 95Left join: All data in the left table, corresponding data in the right tableSyntax: select * from student left join grade on student. no = g

From: http://www.cnblogs.com/kevinGaoblog/archive/2012/07/05/2577410.html--Execute in Query Analyzer:--Build Table Table1,table2:CREATE TABLE table1 (ID int,name varchar (10))CREATE TABLE table2 (ID int,score int)INSERT INTO table1 Select 1, ' Lee 'INSERT INTO Table1 Select 2, ' Zhang 'INSERT INTO table1 Select 4, ' Wang 'Insert INTO table2 Select 1,90Insert INTO table2 Select 2,100Insert INTO table2 select 3,70such as table-------------------------------------------------Table1 | Table2--------

Internal join: Check the data corresponding to the data in the two tables.External join: Check the corresponding data based on a table (full join is based on multiple tables) Student tableNo name12 B3 C4 d Grade tableNo grade1 902 983 95 Join inner join (the data corresponding to the search condition is not listed in No4)Syntax: Select * from student inner join grade on student. No = Grade. NoResultStudent. No name grade. No grade1 A 1

select 1, 90Insert into Table2 select 2,100Insert into Table2 select 3, 70 Inline: Select * From Table1 join Table2 on table1.id = table2.id------------- Result -------------ID name ID score------------------------------1 Lee 1 902 Zhang 2 100------------------------------Note: Only the Table1 and Table2 columns that meet the conditions are returned. Left join: Select * From Table1 left join Table2 on table1.id = table2.id------------- Result -----