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Zhang | Male | 1985 | Computer Systems | Haidian District, Beijing | | 904 | John Doe | Male | 1990 | English Department | Liaoning Province Fuxin | | 905 | Harry | Women | 1991 | English Department | Xiamen, Fujian | | 906 | Wangliuqi | Male | 1988 | Computer Systems | Hunan Province Hengyang |+-----+--------+------+-------+------------+--------------+ 7.

First, prepare the tableNew TableMysql> CREATE TABLE Department (ID int,Name varchar (20));Mysql> CREATE TABLE Employee (ID int primary KEY auto_increment,Name varchar (20),Sex enum (' Male ', ' female ') not null default ' male ',Age int,dep_id int);Inserting dataMysql> INSERT INTO Department values(200, ' technology '),(201, ' human Resources '),(202, ' Sales '),(203, ' operations ');Mysql> INSERT into em

to change1) Create a tableGrammar:create table 表名(字段名1 类型[(宽度) 约束条件],字段名2 类型[(宽度) 约束条件],字段名3 类型[(宽度) 约束条件]);#注意：1. 在同一张表中，字段名是不能相同2. 宽度和约束条件可选3. 字段名和类型是必须的Example:create table t1( id int, name varchar(50), sex enum(‘male‘,‘female‘), age int(3));# 查看db1库下所有表名show tables; select id,name,sex,age from t1;select * from t1;select * from t1;# 往表中插入数据insert into t1 values(1,‘alex‘,‘male‘,20);# 往id字段插入

From: http://www.cnblogs.com/robot/archive/2008/04/20/1161801.html A new bug was found: 10 is smaller than 2 because sort is sorted by ascii by default. This problem has been fixed. Download the latest demo [fixed some known problems, and optimized some with replies from netizens Code , Usage is similar to the original] HTML code [You can ignore it. It has nothing to do with HTML.]: JavaScript code: // Author: Wolf robot Code: New tablesorter ("tb1 ");Effect: Click any header to perfor

There is a school where men and women are located. A girl forgot to bring paper to the toilet. At this time, there were several toilet papers coming next door. The girl was so pale that she whispered: Who? A male replied: progressive. 　　　　　　 There is a school where men and women are located. A girl forgot to bring paper to the toilet. At this time, there were several sanitary napkins next door. The girl was so pale that she whispered: Who? A

In PHP development, there is a large proportion. we are operating on arrays, so the learning of arrays is critical ~~ In PHP development, there is a large proportion. we are operating on arrays, so the learning of arrays is critical ~~ "Iwanghang", "age" => 18, "sex" => "male", "email" => "iwanghang@qq.com "), // $ group [0] array ("name" => "queen", "age" => 14, "sex" => "female ", "email" => "queen@qq.com"), // $ group [1] array ("name" => "kin

One: Dictionary (DIC)A dictionary is the only type of mapping in Python that stores data in the form of key-value pairs (key-value). Python computes the hash function of key and determines the storage address of value based on the computed result, so the dictionary is stored out of order and the key must be hashed. A hash indicates that a key must be an immutable type, such as a number, a string, a tuple.The Dictionary (dictionary) is the most flexible built-in data structure type in addition to

Let's start by looking at a closure function:function A () { var i = 0; function B () { alert (+ +i) ; } return b; } var c = A (); C (); C (); C ();Equivalent tofunction Male 1 () { var child = 0; function Female 1 () { alert (+ + children ) ; } return female 1; } var

Data add and delete change to insert data1. 插入完整数据（顺序插入） 语法一： INSERT INTO 表名(字段1,字段2,字段3…字段n) VALUES(值1,值2,值3…值n); 语法二： INSERT INTO 表名 VALUES (值1,值2,值3…值n);2. 指定字段插入数据 语法： INSERT INTO 表名(字段1,字段2,字段3…) VALUES (值1,值2,值3…);3. 插入多条记录 语法： INSERT INTO 表名 VALUES (值1,值2,值3…值n), (值1,值2,值3…值n), (值1,值2,值3…值n);4. 插入查询结果 语法： INSERT INTO 表名(字段1,字段2,字段3…字段n) SELECT (字段1,字段2,字段3…字段n) FROM 表2 WHERE …;Update data语法： UPDAT

, 3.50, 3.31, 3.61], ' sex ': [' Fem Ale ', ' Male ', ' Male ', ' Male ', ' Female ']}) # data type of Columnsprint df.dtypes# indexesprint df.index# return pandas. Indexprint df.columns# each row, return Array[array]print Df.valuesprint DF Sex objecttip float64total_bill float64dtype:objectrangeindex (start=0, stop=5, Step=1) Index ([u ' sex

Introduction: What is an algorithm?How to find a stable marriage match It is said that a book starts with a straightforward talk about gender topics, and this book will soon sell well. Fortunately, among the many topics that can be used to introduce "algorithms", my favorite one has such a relationship with the gender. If you are a matchmaker, there are several single men asking for help, there are also a number of single women also come to marry. If you already know the ranking of these girls i

What is JSON?JavaScript Object Notation (JAvaScript Object Notation). JSON is a lightweight data interchange format in which a JSON-formatted file can grow like this: 1234 {"name":"hanzichi","sex":"male"} It looks like Key-value's key-value pair, which is the object of JS? Yes, but at the same time JSON is not satisfied, I can not be the same as JS object, I have to have my own personality, so the key-value pair must

(' Zhang San ', 21, ' Male ', 1)INSERT into student table (Name, age, Gender, Class) VALUES (' John Doe ', 27, ' Male ', 2)INSERT into student table (Name, age, Gender, Class) VALUES (' Harry ', 24, ' Male ', 5)INSERT into student table (Name, age, Gender, Class) VALUES (' Saturday ', 26, ' Male ', 2)INSERT into stude

The dictionary dict is the only built-in mapping type in Python, consisting of key-value pairs, which are unordered. The keys of a dictionary must be immutable objects, such as strings, numbers, tuples, and so on, while lists, dictionaries, and tuples that contain mutable objects cannot be keys. The mutable and immutable meaning here is that the object can be hashed, and the built-in function hash () can be used to test whether the object can be hashed. The value of the dictionary can be any obj

, unit name, gender, education). The information for this table is: Test_teacher (id,name,dw_name,sex,degree). 1. question one: How to count totals and proportions in a single table It is now necessary to count the number of teachers in each unit and the number of people with different qualifications and gender in the unit. This is a very common problem, when the project is a lot of statistics, including: Age, Learning edge, title, Professional and so on.This is very simple and a lot of meth

Tags: ike _id row character order line data position minimum 0 rows(1) Single-table query 1) Environment preparationmysql> CREATE TABLE company.employee5( id int primary key AUTO_INCREMENT not null, name varchar(30) not null, sex enum(‘male‘,‘female‘) default ‘male‘ not null, hire_date date not null, post varchar(50) not null, job_description varchar(100), salary double(15,2) not null, office int, dep_id in

JSON introduction and usage code summary, json introduction SummaryWhat is JSON? JavaScript Object Notation (JavaScript Object Notation ). JSON is a lightweight data exchange format. For example, a file in a JSON format can grow like this: { "name": "hanzichi", "sex": "male"} It looks like key-value pairs, just like JavaScript objects? Yes, but at the same time, JSON indicates that I am not satisfied. I cannot grow like a js object. I have to have m

JSON introduction and usage summary, JSON introduction and usage Summary JSON (JavaScript Object Notation) is a lightweight data exchange format. It is very easy for programmers to process data and facilitate machine data parsing and generation. It is widely used. JSON is a lightweight data exchange format. For example, a file in a JSON format can grow like this: {"name": "hanzichi","sex": "male"} It looks like key-value pairs, just like JavaScript ob

MySQL Database Advanced query multi-Table query and join Table query Query all emp_name information in the EMP table. Mysql> select * from EMP where emp_name = 'xiaotian '; The query result is as follows: + -------- + ---------- + --------- + ------------ + --------- + | Emp_id | emp_name | emp_age | emp_sal | emp_bir | emp_sex | + -------- + ---------- + --------- + ------------ + --------- + | 100005 | Xiaotian | 27 | 4000 | 1979-07-10 |

A man sold pigs in a rush, and 20 pigs were not sold in the dark, so he went to a farmer's house to stay. The young woman said: it is inconvenient to have only one person at home. Male: Please give me a pig. Female: Okay, but there is only one bed at home. Male: I am also sleeping in bed, and I have another pig. Female: Agree. Discuss with a girl in the middle of the night. I will go to bed with you.