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Tag: statements
How to understand C language branches and loop statements
1. Branch statement~ Branch statements are also called conditional judgment statements, which are divided into if statements and switch statements; 1.1 What is a branch statement: A branch statement is also called a selection structure Simple example (hypothesis): If you study hard, you can get good grades and find a good job. On the other […]
Example of custom SQL statements using case/when statements to implement paging queries and classification sorting in JPA programming
1. Requirement background Query the list of work orders initiated by me and invited by me. It requires paging query. The specific requirements for sorting are: Sort by status first, with unprocessed items at the front Then sort by handler, those who were invited are ranked first, and those who initiated themselves are ranked last. […]
Project3: Implemented execution transactions for multiple statements
Implemented execution transactions of multiple statements, such as GROUP BY, JOIN, TOP-N, INDEX-SCAN Mainly build the executor The processing model of a DBMS defines how the system executes query plans. There are different trade-offs for different workloads. Volcano model: Here is a detailed description of the volcano model: Operators and Operations: The Volcano model breaks […]
Master Python in 14 days_operators_loop statements_string formatting_(2)
Today is our second day of learning Python. There seems to be a lot of tasks. If there are any mistakes, I hope you can leave a message below to nullptr.cpp. First of all, thank you for watching Operator_Loop statement_String formatting .operator Five operators you must master operator precedence .Branch and loop statements if and […]
MySQL concepts and sql statements
The concept of database The concept of database: A database is a warehouse used to organize (each data is related and organized according to rules), storage and management (add, delete, modify, check) Database Management System (DBMS): System software that realizes effective organization, management and access of data A database is a system, a human-computer system. […]
JavaScript operators and statements
Operator 1. Assignment operator Assignment operator: operator that assigns values to variables The assignment operators are: + = -= *= /= %= num + = 3 is equivalent to num = num + 3 2. Unary operators Operators that can perform calculations using only one number Self-increment: Symbol: + + Function: Let the value of […]
[C Language] Loop statements while / for / do while / break and continue / goto statements
[C Language] Branching and Looping (Part 2) 1. while loop 1.1 Comparison between if and while 1.2 Execution flow of while statement 1.3 Practice of while loop 1.4 Exercise 2. for loop 2.1 Grammatical form 2.2 Execution process of for loop 2.3 Practice of for loop 2.4 Comparison between while loop and for loop 2.5 […]
Add 2 statements to solve the problem of cufflinks’ .iplot not displaying pictures
Environment: jupyter notebook, win7, win10, chrome browser, edge browser, bug: .iplot of cufflinks does not display images The phenomenon is: 1 – Use matplotlib.pyplot to display images. 2 – Plotly’s iplot method can save pictures to a folder, but using plotly’s iplot method, jupyter notebook does not display pictures. It means that the problem is […]
MYSQL database concepts and sql statements
What is data Number: digital information Data: attribute or some kind of credential Data: A collection of information describing specific attributes of an object. What is a database Database: It is a warehouse used to organize (organized according to rules), store and manage (add, delete, modify and query data) data. Databases are important information assets […]