-
Anonymous users2024-02-06At present, no matter what the scale of the mainstream database, such as access (which is basically unused now), MySQL, Microsoft Server SQL, or large-scale Oracle, are relational databases, I say this is very abstract, you may not know what a relational database is, so you should first learn the introduction to database systems, understand the meaning of its existence, understand its position in computer systems, and then go further**, I think the cutting-edge basic course should be discrete mathematics. Because it involves relational calculus, relational algebra, and a series of abstract concepts are related to discrete mathematics, in the future, efficient nested queries, modifications, deletions, and additions to data are all involved, but if it is for small development, efficiency is not important, you can use some visual software to establish and maintain the database, but in the process of use, it is inevitable to encounter problems that you do not understand, such as entity integrity constraints, the establishment of the main code and foreign code of the table, security considerations, and paradigm theory, which are more difficult to understand, so it is recommended to start with discrete mathematics, and then look at the database system introduction books, and then choose a smaller scale such as MySQL for the practice of SQL language, and then the relationship between the database and software or network such as J2EE technology, but also to face many problems, in short, step by step, step by step, do not hurry, I wish you success in learning!
-
Anonymous users2024-02-05I feel that you have to learn what to do in the database, if you want to develop a project, such as ** development, you don't need to know too much, some common SQL statements will be used, stored procedures will be used, as well as views, transactions, these are more commonly used in project development, if you want to learn is to learn the database, or you have to start from the most basic to learn, you can start with the introduction to databases.
-
Anonymous users2024-02-04Generally, the easiest way to save user data is to import user data into a file, such as saving user password information.
-
Anonymous users2024-02-03Databases are the foundation of software and technology.
-
Anonymous users2024-02-02The database is what all projects need, it is the place where the data is stored, and if you want to do a project, you must use the database, so you must learn the database.
-
Anonymous users2024-02-01First of all, SQL is definitely something to learn. C language is a programming language, programming language can be used for database connection and complex data logic operations, except for C language, all programming languages can achieve these functions to accompany the split energy, so C language is not necessary to learn, you can learn any programming language. AESS is a database implementation that you don't need to learn at all, because the most used databases in the world today are Oracle, MySQL, SQLTite, and PostgreSQL, all of which are free.
In addition to the old SQL, you also need to learn the characteristics and some syntactic differences of the database used. Different databases have different characteristics, such as Oracle's database-side development capabilities, MySQL several forms of blob storage, etc., in general, you must be proficient in the database you use.
In addition, some basic knowledge is required, such as relational algebra, database paradigms, entity relational models, and so on.
You can make an information query system, if you haven't done it before, it is recommended to use ASP to write it first, this is relatively simple, even people who do not have a basic knowledge of network programming can get started in a short period of time. The written web program can be called on the network, and different permissions can be set for different users. In this way, you can achieve the function you want, but this is only the basic, and you should learn more deeply to achieve more complete functions. >>>More
The database is generally composed of many tables, for example, the school builds a database, which can build a student table (including the student's name, age, student number, class, date of birth), a teacher table (including the teacher's name, age, teaching class, teaching category), a report sheet (including the student's student number, and the grades of each subject), etc. These are the ways in which the files are stored in the database, and try to make sure that the items in a table are closely related and have the same attributes, if this condition cannot be met, a table must be built (the redundancy of the built table has 4 levels). In order to meet the user's query needs, we also need to make a number of views, for example, you can make a view of his items have the name of the student, age, grades of each subject, and the teacher of each subject, etc., we can also export new items according to the existing items, for the purpose of simplicity, for example, the view can add an average grade, we add different permissions and roles to each view, and provide it to different people to query to protect the security of the database. >>>More
Create a database.
Select the Program Management SQL Server 2008 SQL Server Management Studio command in the Start menu to open the SQL Server Management Studio window and establish a connection using Windows or SQL Server authentication. >>>More
First: you are lazy and push everything to someone else.
Second: There are no bonus points for your question. >>>More
function updatepage(targetobject){if( == 4){
var response = ;Assign the value returned by ajax to the responseIf you want to use this variable, you can call it directly, or you can return it outside of the function. >>>More