benefits of oracle database

At the underlying layer of Hibernate, SQL statements are still used to perform database operations. Although all relational databases support standard SQL statements, all databases have extended standard SQL statements, therefore, there are some differences in syntax details. Therefore, Hibernate needs to identify these differences based on the database. For example, you only need to use the limit keyword f

Defined:A stored procedure (Stored Procedure) is a set of SQL statements that are compiled and stored in a database in order to accomplish a specific function. The user executes it by specifying the name of the stored procedure and giving the parameter (if the stored procedure has parameters). Stored procedures are an important object in a database, and any well-designed

Objects | data | Database We all know how to get the rows (records) We need from MySQL, read the data, and then access some of the changes. Obviously it's also straightforward, and there's nothing to beat around this process. However, when we use object-oriented programming (OOP) to manage the data in our database, the process needs to be greatly improved. This article will make a simple description of how

Objects | data | Database We all know how to get the rows (records) We need from MySQL, read the data, and then access some of the changes. Obviously it's also straightforward, and there's nothing to beat around this process. However, when we use object-oriented programming (OOP) to manage the data in our database, the process needs to be greatly improved. This article will make a simple description of how

as employee work number, employee name, employee position, and so on in the employee table. This is equivalent to in the employee relationship, the projection operation, that is, the selection of employee work number, employee name, employee position 3 attributes, forming a new relationship, 1 shows.Figure 1 Using projection operations to get a view of ordinary users Vw_employeesSimilarly, for advanced users, you can create a view named Vw_employees_hr, which selects all the columns in the Empl

Article Source: http://chenwei.me/p/24.htmlBenefits of indexingThe benefits of indexing can be considered by many readers to be just "improving the efficiency of data retrieval and reducing the IO cost of the database". Indeed, the greatest benefit of creating an index on a field in a table in a database is that the field can be used as a retrieval condition to g

trend compression is as shown, T1 to T2 time the value of a measured point hold the trend, then the trend of the two tolerance line will be the next point in the dead zone range, if the next moment T3 between the two two tolerance lines, then do not record this value, two tolerance line will apply to the next moment, if the next moment T4 This value is recorded in addition to the two two tolerance lines, the trend changes, two tolerance lines change, and the next point of measurement is judged

Label:We all know that MySQL database partitioning (Partition) can improve the performance of MySQL database, so what is the MySQL database partition? And what are the benefits of its practical application? The following article is a description of the content. What is a database