Page 96-Oracle Programming Tutorials: Learn Oracle Online-php.cn

Article Tags

Oracle

Home

Technical articles

Database

Oracle

Detailed introduction to the syntax of Oracle stored procedures

An Oracle stored procedure is a piece of pre-compiled PL/SQL code that can be called and executed when needed. Stored procedures can encapsulate some business logic, improve SQL execution efficiency, and can encapsulate complex operations into a simple operation by calling the interface, improving the maintainability and reliability of database applications. This article will introduce the syntax of Oracle stored procedures in detail. Creating Oracle stored procedures In Oracle, there are two main ways to create stored procedures. One is to use CREATE PROCEDURE

Apr 18, 2023 pm 03:23 PM

How to find the software installation path in oracle linux

Oracle Linux is a Linux distribution developed by Oracle. It is an operating system based on Red Hat Enterprise Linux. It is very similar to Red Hat Enterprise Linux and supports x86, 64-bit and ARM processor architectures. When using Oracle Linux, if you need to install some software packages or services, you need to first understand the installation path of the software. In Oracle Linux, the software installation path

Apr 18, 2023 pm 03:22 PM

Reasons and solutions why oracle em cannot be opened

Oracle Enterprise Manager (EM) is a management and monitoring software from Oracle. It can help users view the performance of databases and applications in real time, and provides powerful diagnostic capabilities. Once EM fails to run normally, it will cause problems to users. A lot of inconvenience. In actual use, the problem that Oracle EM cannot be opened is very common. For example, when connecting to the database, users may encounter the following problems: 1. Timeout error When users try to access the database in EM, they may encounter

Apr 18, 2023 pm 03:22 PM

How to delete all user tables in oracle

Oracle is currently the most popular relational database management system in the world. However, when a user needs to be deleted, all tables of the user may be deleted. Following are some methods to delete user-owned tables in Oracle. 1. Use the DROP USER command. Use the DROP USER command to delete the user and all tables and objects owned by the user. However, this command is only suitable for situations where users and their objects need to be completely deleted, and may cause severe data loss. The syntax for using the DROP USER command is as follows

Apr 18, 2023 pm 03:22 PM

Discuss the basic knowledge and conversion techniques of Oracle SQL

In database management and development, SQL is a query language that must be mastered. Among the SQL languages, Oracle SQL is the most important and widely used dialect. In this article, we will discuss the basic knowledge and conversion skills of Oracle SQL to help everyone become more proficient in using this kind of SQL. The basic syntax is the same as other SQL dialects. In Oracle SQL, users query data in the database by using the SELECT statement. The following is a basic query syntax: SELECT column1,

Apr 18, 2023 pm 03:22 PM

How to query the primary key table in oracle

In Oracle database, the primary key of a table is an important database entity constraint, usually used to ensure the integrity and uniqueness of data. When we need to query a table with a primary key, there are several ways to do it. Method 1: By querying the table structure information, we can query the system view or table structure information to obtain the primary key information of the table. The following are some commonly used query statements: 1. Query the primary key name of the table```sqlSELECT constraint_nameFROM user_constraintsWHERE t

Apr 18, 2023 pm 03:22 PM

How to configure Oracle after installation

Oracle is a powerful database management system that is widely used in the development and management of enterprise-level applications. After installing Oracle, we still need to do some configuration to ensure that it runs properly and meets our needs. The following will introduce some configuration operations that need to be performed after Oracle installation. 1. Set environment variables When installing Oracle, we need to add the Oracle installation path to the system environment variables. This makes it easier for us to use Oracle related commands on the command line. In Windows system

Apr 18, 2023 pm 03:22 PM

How to perform hexadecimal conversion in oracle

Oracle is a relational database management system that is widely used in the development of enterprise-level applications. In Oracle database, we often need to perform base conversion, such as converting decimal to binary or hexadecimal. This article will introduce the base conversion function and its application in Oracle. Commonly used bases in Oracle include binary (base 2), octal (base 8), decimal (base 10) and hexadecimal (base 16). 1. Binary conversion function: TO_BINARY_DOUBLE, TO_BI

Apr 18, 2023 pm 03:20 PM

How to query oracle time format

There are many different time formats in Oracle Database that can be used to store and display date and time information. The correct time format is very important when querying and analyzing data. This article will introduce how to query the date and time format in the Oracle database, and how to output the date and time data into the specified format. Oracle Date Format The date formats supported by Oracle database include: 1. Year-Month-Day (YYYY-MM-DD) 2. Month/Day/Year (MM/DD/YYYY) 3. Day.Month.Year

Apr 18, 2023 pm 03:20 PM

What should I do if Oracle cannot connect to the database?

It is very common for enterprises to use Oracle databases, but due to various reasons, sometimes it is found that the database cannot be connected. At this time, you need to analyze and troubleshoot the problem to find the cause and solve it. First, we need to check if the database server is started. In the Oracle database, you can use the following command to check: ```lsnrctl status``` If the database server has been started, but we still cannot connect, you need to check whether there is a network failure. For example, check that firewall rules are set correctly and confirm

Apr 18, 2023 pm 03:20 PM

How to modify the IP address of Oracle database

How to modify the IP address of Oracle database Oracle database is one of the most popular relational databases in the world. It can run on various operating system platforms, including Windows, Linux and Unix. In practical applications, we often need to modify the IP address of the Oracle database to adapt to different network environments. This article will introduce you to how to modify the IP address of Oracle database. Step 1: Check the current IP address. Before modifying the Oracle database IP address, we first

Apr 18, 2023 pm 03:20 PM

How to set up auto-increment in oracle

There is no built-in auto-increment feature in Oracle Database, but there are many ways to simulate it. The following are some methods for simulating auto-increment: 1. Sequence Sequence is an object used to generate unique numbers in Oracle database, similar to auto-increment. Sequences can be created separately before or after the table is created, and can be changed as needed. First, create the sequence: ```CREATE SEQUENCE seq_nameSTART WITH 1INCREMENT BY 1NO

Apr 18, 2023 pm 03:19 PM

How to query oracle user space

Oracle database is one of the most commonly used databases at present. Its use covers many fields such as enterprise applications, large data warehouses and cloud solutions. In Oracle, each user is allocated a certain amount of space to store his own objects, such as tables, indexes, views, etc. Therefore, querying Oracle user space is very necessary. There are many ways to query Oracle user space, including SQL query, Oracle Enterprise Manager (OEM) or PL/SQL.

Apr 18, 2023 pm 03:19 PM

How to batch modify Oracle

Oracle is one of the most popular and popular database management systems in the world. It can handle large amounts of data and provides high scalability and flexibility. Oracle also provides many powerful tools and features, making it the first choice for enterprise-level data management. In Oracle, we can use SQL statements to query, update, insert and delete data. However, if you want to modify a large amount of data at the same time, manually changing one by one is obviously not the best choice. This article will introduce how to use Oracle's tools and syntax to modify data in batches. 1. Use SQ

Apr 18, 2023 pm 03:19 PM