search functions, there are some functional limitations, such as writing case functions. Note that the case function returns only the first value that meets the condition, and the rest of the case will be automatically ignored. For example, in the following SQL statement, you will never get the result code of "Class 2": case when col_1 in ('A', 'B ') then 'first class 'when col_1 in ('A') then' Second Class 'else' others'. Next let's take a look at what the case function can do. 1. Known Data i
primary key)
Country Population (Population)
China 600
US 100
Canada 100
UK 200
France 300
Japan 250
Germany 200
Mexico 50
India 250
The population of Asia and North America is counted based on the population data of this country. The following result is returned.
Continent population
Asia 1100
North America 250
Other 700
What do you do if you want to solve this problem? Generating a view with continent code is a s
Below are some of the logic test questions of the world's top five hundred companies. Can you answer them in five minutes:
Problem:
1. Two turtles race
Two turtles race together. Turtles arrive
10 meters
Turtle B ran to the finish line
9 meters
. Now, if you want to let the turtle's start line fall back by one meter, then the two turtles start the competition at the same time and ask if both turtles reach the end at the same time?
2. climb the stairs
A gentleman is going to work o
December through hyperinflationary 0.17, into the contraction of the dilemma. As long as the information shows that the euro-zone hyperinflationary is hovering around 06, it will greatly increase the likelihood that the ECB will open QE in this month's meeting, and it will re-pressure the euro. In the first part of the period, the investor has to focus on the economic information of the United States and Canada, in which the US ADP December is worth
the results of the discussion.((Picture on the right) Instructor Yang made a wonderful comment.
The course "best practices and practical application of international project set management" is jointly developed by professors from China and Canada. On the basis of summarizing the international project set management standard system and best practices, the course is based on solving the problem of strategic implementation of domestic organizations, i
Face customer introducing yourself to new clients
Jennifer wants to enter the Meijia market. After weeks of correspondence and fax, she finally made an appointment with a Chinese-disk distributor in Canada, standard household appliances, to discuss the possibility of cooperation in person. Jennifer's first meeting with the buyer not only explained the company's current plan, but also told the other party about the role they played in the discussion.
1. The CMP function is a python-brought function that compares two parameters which is the size of a smallPrint CMP (2, 3) # -1print cmp (2, 1) # 1print CMP (2, 2) # 0If the first argument is smaller than the second one, it returns 1, two elements are equal, returns 0, otherwise 12. So you can use this function to customize your own comparison rules.defcmp_country_size (Country1, Country2): Alist= ['United States','China','Canada','Russia'
service, with tens of thousands of customers at home and abroad to establish a loyal cooperative relationship, the developer appreciated and recognized, and in 1994, the largest development in New Zealand, Fletcherchallenge awarded the Outstanding Sales Award, And 1999 France's largest real estate developer appointed the company for the Southeast Asian property General agent. We have successfully planned and sold hundreds of large-scale projects in China, France, Singapore, the United States an
variable must be defined before it is used, and the string variable is defined with the class name string. Such as:
string string1; Defines string1 as a string variable string
String2=″china″//definition string2 to initialize it at the same time
It should be noted that to use the functions of the string class, you must include the string header in the C + + standard library at the beginning of this file, which should be added
#include
2 assignment to a string v
by the Microsoft FTP site, and the new patches will include all previous patches, when this article was written, the Windows NT Service Pack was Service Pack 5, and the latest Exchange 5.5 Service pack was the services Pack2.
Encryption
Not all service packs are equal, TechNet's service packs are 40-bit encrypted, which is the maximum allowed by the U.S. government. Needless to say, a 40-digit password is hard to crack. However, if you are in the United States or
Key) country (country) population (population) China 600 USA 100 Canada 100 UK 200 France 300 Japan 250 Germany 200 Mexico 50 India 250 According to the population data of this country, the number of population in Asia and North America is counted.
The following result should be obtained. Continent Population Asia 1100 North America 250 Other 700 what would you do if you want to solve this problem?
Creating a view with a continent code is a workaro
sales law rules that the United States and Canada can only use the 40-bit length for encryption and decryption in the field. As a result, SSL (Secure Sockets Layer) in the United States and Canada can use 128-bit, but SSL in the field can only use 40 bits.
SGC (server-gated cryptography) is an extension of SSL using 128-bit, limited to use on bank or other approved applications. SGC is the 128-bit SSL tha
"))
Return Ic1.compareto (IC2);
Else
Return Ic2.compareto (IC1);
}
[STAThread]
static void Main (string[] args)
{
Country country1 = new Country ("USA", "Washington D.C.");
Country Country2 = new Country ("Canada", "Ottawa");
Country country3 = new Country ("France", "Paris");
Country Country4 = new Country ("Australia", "Canberra");
Country country5 = new Country ("Mexico", "Mexico City");
ArrayList al = new ArrayList ();
Al. ADD (Country1);
Al. AD
ignored.One, the known data in a different way to group, analysis. There is the following data: (in order to see more clearly, I did not use the country code, but directly with the country name as primary Key) country (country) population (population) China 600 USA 100 Canada 100 UK 200 France 300 Japan 250 Germany 200 Mexico 50 India 250 According to the population data of this country, the population of Asia and North America is counted. The follow
Tags: SQLite search SRC Reference sdn US border. com CenterBasically learned the next SQL function statement, case when similar to the C language in the Switich cases statement, multi-branch selection, different values can have a different amount of return. For example, in a table that contains a sex field, the possible value is 1, 2, and after the subordinate statement is executed, a value of 1 returns the male, where the value is 2 to return the female.--Simple case function when ' 1 '
United States
100
Canada
100
UK
200
France
300
Japan
250
Germany
200
Mexico
50
India
250
expected query results:
Chau
Population
Asia
1100
North america
250
Other
700
a.department_id = B.department_ ID and a.salary > b.salavg;
4. Single-row sub-query Using a single-column subquery in a case --PROBLEM: Explicit employee's employee_id,last_name and location.
--among them, if the employee department_id is the same as the department_id of location_id 1800,
--the location is ' Canada ' and the rest is ' USA '.
SELECTEmployee_id,last_name, ( Casedepartment_id when
(SELECTdepartment_id
≤min (n, 50)) –the number of cakes and the number of B Oxes, respectively.
The second line contains n integers a1, a2, ..., an (1≤ai≤n) –the the types of cakes to the order the oven bakes.
Output
Print the only integer–the maximum total value is boxes with cakes.
examples Input
4 1
1 2 2 1
examples Output
2
the
There are n n numbers divided into k K K, each segment of the value of which is the number of different numbers, to find the total maximum value.
train of Thought
It is easy to think
/*
A milking problem, the milking people have m working time periods, each time period has a certain output
One time period must be completed before work can be done another time period
After working for a period of time, must rest R time
So, to solve the problem, you can first add the end time of each time period to the R
The maximum output that can be produced is now required for a given m time period
Dp[i], which represents the maximum amount of milking produced during the I time period,
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