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()---------------------------{"Ismale": True, "name": "Zhangsan", "classmates": [{"Age": 0, "male": false},{"Age" : One, "male": false},{"Age": +, "GF": {"$ref": "$.classmates[1"}, "male": True, "name": "Zhang San"}], "fav": {"Sports": [], " Musics ": [Welcome to Beijing]," painting The Heart "," History ": [" Historical records "," Three Kingdoms "]," arts ": [

Tags: structure Data company nbsp Char remove DEP information valAn introductionTopics in this section Multi-Table Connection query Compound conditional Join Query Sub-query Prepare table Company.employeeCompany.department #建表 CREATE TABLE department (ID int, name varchar (20)); CREATE TABLE employee (ID int primary key auto_increment, name varchar (), sex enum (' Male ', ' female ') not null default ' MA Le ', age int, dep_id int); #插入数据 INSERT

Tags: sel cottage Learning-fuzzy query predicate student har IkeConnection queries: Design query join conditions or join predicates for two or more tables: The conditional general format used to connect two tables:[[Equivalent connections:The join operator is =Find out about each student and elective courseMysql> Select Student.*, sc.* from STUDENT,SC where student.sno=sc.sno;+-------+--------+------+------+-------+--- ----+-----+-------+| Sno | sname | Ssex | Sage | sdept | Sno | CNO | Grade |+

Copy Code code as follows: Tb_student's student table CREATE TABLE Tb_student ( Stunum Char (7) Primary key,--school number Stuname Char (8) NOT NULL,--Name Stusex char (2) Check (Stusex in (' Female ', ' Male ')),--gender Stubirthday smalldatetime NOT null--student Birth date Stuspec Char (6) NOT null--professional Stuscore Numeric (4,1)--admissions results Stuloan char (2) Check (Stuloan in (' Yes ', ' no ') not NULL

An introductionTopics in this sectionMulti-Table Connection queryCompound conditional Join QuerySub-queryPrepare tableCompany.employeeCompany.department#Build TableCREATE TABLE Department (ID int,name varchar (20) ; CREATE table employee (ID int primary KEY auto_increment,name varchar (20), sex enum ('male','female') notNull default'male', age int,dep_id int);#Inserting DataINSERT INTO department values (200,'Technology'),(201,'Human Resources'),(202,

/**MySQL Multi-Table Association*/One-to-one correlation such as city and area code correlation *******************First a city tableCID City Coid1 Beijing 12 Shanghai 23 Guangzhou 3One more Area code tableCoid Code1 0102 0203 0755This connects two tables together through the Association of CID and CoidSingle-to-one type his associated fields can be placed in two tables.Mysql> SELECT * from City,code where city.coid=code.coid;+-----+------+------+------+------+| CID | City | coid | coid | Code |

Tags: exists nbsp des AC style connection sel table implementation First, Introduction Second, multi-table connection query Three, meet the conditions of connection query Four, sub-query First, IntroductionTopics in this section Multi-Table Connection query Compound conditional Join Query Sub-query Prepare table #Build Table CREATE TABLE dep (ID int, name varchar (20) ); CREATE TABLE EMP (ID int primary key auto_increment, name varchar (20), sex

Tags: city information teacher REM Auto 5.0 values Shaanxi needs Create student table IF not EXISTS ' student ' ( ' id ' int (4) unsigned not NULL auto_increment, ' name ' varchar (a) Not null, ' sex ' enum (' Male ', ' female ') not null default ' male ', ' age ' tinyint (4) is not null default ' + ', ' edu ' enum (' early Middle ', ' High school ', ' College ', ' Big Ben ', ' graduate ') NOT NUL

Tags: here insert data close Cartesian product Mil create table field sales keyMulti-Table Query Multi-Table Connection query Compound conditional Join Query Sub-query First, prepare the table#建表create Table Department (ID int,name varchar (20) ; CREATE table employee (ID int primary KEY auto_increment,name varchar (20), sex enum (' Male ',' Female ') notNULL default ' Male ', age int,

Female: In? Male: Well, I haven't seen you for a long time. What are Tsinghua College Students busy? Female: nothing, that is, learning and work. Male: Oh, it's rare to see you go online. Busy people, you are also monotonous in space. You don't even have a picture! Female: I usually don't talk about QQ. I think it is a waste of youth, time, and energy. It is really boring. It takes a lot of time to

Data Query Language (Oracle VS MySQL)Simple QuerySuppose there is such a table students:STUDENT_ID MONITOR_ID NAME SEX DOB SPECIALTY------------------------------------------------------------10101 Wang xiaofang female-88 computer10205 Li qiufeng male 25-11 month-90 Automation10102 10101 Liu chunping female 12-8-91 computer10301 mountain male-90 Mechanical and Electrical Engineering10207 10205 Wang Gang

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. In the middle of the night, I went to bed with you.

=buffer), after which the strtok needs to be NULL for the first (buf=null) parameter. Pointer column p[], the result of the cut is stored, p[0]= "John", p[1]= "John", p[2]= "Ann", and Buf becomes fred/0john/0ann/0.2. Strtok's weaknessesLet's change our plan: We have a string "Fred male 25,john male 62,anna female 16" We want to sort this string into a struct,Quote:struct Person {char [+] name;char [6] sex;C

1. Strtok Introduction As is known to all, Strtok can be based on the user-supplied delimiter (which can also be plural for example). ”）Splits a section of string until it encounters a "yes". For example, the delimiter = "," string = "Fred,john,ann" by Strtok, 3 strings of "Fred" "John" "Ann" can be extracted. The C code above is Copy Code code as follows: int in=0; Char buffer[]= "Fred,john,ann" Char *p[3]; char *buff = buffer; while ((P[in]=strtok (buf, ","))!=null

Connected to Oracle Database 11g Enterprise Edition Release 11.2.0.1.0Connected as [email protected] as SYSDBASql>Sql>--Create userSql>create user LPA identified by liPeng1;User createdSql>--Grant DBA authority to the userSql>Grant DBA to LPA;Grant succeededSql>--Create use table spaceSql>Create tablespace liPeng112datafile ' E:\oracle11\liPeng1.dbf '3size 1500M4autoextend on next 5M maxsize 3000M;Tablespace createdSql>--Grant users permission to use the tablespaceSql>ALTER user LPA quota unlimi

Python Dictionary A dictionary is another mutable container model and can store any type of object. Each key value of the dictionaryKey=>valuePair with a colon:Split, with commas between each key-value pair,Split, the entire dictionary is included in curly braces{}, the format is as follows:D = {Key1 : value1, Key2 : value2 The key must be unique, but the value does not have to be. The value can take any data type, but the key must be immutable, such as a string, a number, or a tuple.

string in a static variable for the next call# Endif/* _ Mt */ /* Determine if a token has been found .*/If (string = Str)Return NULL;ElseReturn string;1. strtok IntroductionAs we all know, strtok can be based on user-provided delimiters (and separators can also be plural numbers, such as ",").Splits a string until "\ 0" is encountered ".For example, separator = "," string = "Fred, John, Ann"Using strtok, we can extract the three strings "Fred", "John", and "Ann.The above C code isQuote: int In

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Document directory 2. 1. instance 1 2. instance 2. 2. 1. instance 1 2. instance 2. Use of jsonobject and jsonarray 1. jar package Introduction To run a program, the JSON-lib package must be introduced. The JSON-lib package depends on the following jar package: Commons-lang.jar Commons-beanutils.jar Commons-collections.jar Commons-logging.jar Ezmorph. Jar Json-lib-2.2.2-jdk15.jar 2. Use jsonobject The JSON-lib package is a package that converts beans, collections, maps, Java arrays,

prototype object, which is, of course, invisible to the developer. (4) If the prototype of constructor A is set to an instance of constructor B, then the prototype of constructor A contains a pointer to another prototype, thus forming a prototype chain. This enables inheritance. When using an object's properties or methods, the parser searches the instance internally, cannot find the inside of the prototype of the search instance, and then finds no internal prototype of the constructor for the