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Database

Oracle

How to query child nodes in oracle

In Oracle database, querying the child nodes of a node is a common need, especially when dealing with large hierarchical data. In this article, we will introduce how to use Oracle's CONNECT BY statement and SYS_CONNECT_BY_PATH function to query child nodes. First, let's take a look at the CONNECT BY statement. The CONNECT BY statement is a recursive query statement of Oracle, which allows querying tree structure or hierarchical data. CONNECT B

Apr 18, 2023 am 09:07 AM

How to implement stored procedures in oracle to call stored procedures

1. What is a stored procedure? A stored procedure is a special program created in the database. It is a collection of SQL statements, stored on the database server, and can be called by multiple applications. Stored procedures have the following characteristics: 1. Stored procedures are created in the database and are independent of the application, and their code is not affected by the application code. 2. Stored procedures can use control statements such as variables, conditional statements, and loop structures. 3. Stored procedures can accept parameters, which can be input parameters, output parameters, or both input and output parameters. 4. Stored

Apr 18, 2023 am 09:07 AM

Detailed introduction to the syntax and precautions of Oracle stored procedures

A stored procedure is a special program in the Oracle database that can accept parameters, execute a series of SQL statements and branch statements, and ultimately return results or produce effects. Using stored procedures can simplify complex SQL statements and improve database performance and security. So, how to write Oracle stored procedures? The following will introduce the syntax and precautions of Oracle stored procedures in detail. 1. Create a stored procedure The syntax for creating a stored procedure is as follows: CREATE [OR REPLACE] PROCEDURE pro

Apr 18, 2023 am 09:07 AM

How to modify field length in Oracle database

Oracle is a commonly used relational database management system. When using Oracle database, you may need to modify the length of a field in the table. This article will detail how to modify field length in Oracle database. First, we need to understand the syntax for modifying field length in Oracle database. In Oracle, you can use the ALTER TABLE statement to modify the table definition. The ALTER TABLE statement allows you to modify information such as column name, data type, and length. Below is ALTER TA

Apr 18, 2023 am 09:07 AM

How to create and call Oracle stored procedures

In Oracle database, a stored procedure is a precompiled program unit that can be created and stored in the database for subsequent calls. Stored procedures can receive input parameters and return output parameters, and can have conditional statements and loop structures, similar to functions or subroutines in programming languages. When using Oracle stored procedures, we need to create the stored procedures first and then call them. The following will introduce how to create and call Oracle stored procedures. Create a stored procedure 1. To create a stored procedure, you need to create a PL/

Apr 18, 2023 am 09:07 AM

Let's talk about the conversion method of Oracle timestamp

The timestamp used in Oracle database is based on Greenwich Mean Time and is an 18-bit number stored in binary. For the average user, this timestamp is not intuitive and requires conversion. This article will introduce the Oracle timestamp conversion method. 1. The structure of Oracle timestamp Oracle timestamp consists of two parts: 1. Date part (7 bytes): Contains date information, expressed as the number of days since January 1, 1601. 2. Time part (1 byte): Contains time information, starting with 100

Apr 18, 2023 am 09:07 AM

How to start and shut down an Oracle database

Oracle is a common relational database management system. Oracle needs to run on a specific operating system, such as Linux, Windows, etc. You need to start Oracle before using it and shut it down when you do not need to use it. This article will introduce how to start and shut down the Oracle database. 1. Start the Oracle database 1. Find the Oracle home directory. Before starting the Oracle database, you need to find the Oracle home directory. This home directory is often called Oracle Home. exist

Apr 18, 2023 am 09:07 AM

How to delete synonyms in oracle

With the development of modern science and technology, information security issues have received more and more attention. However, in large enterprises or institutions, database security management has become a serious challenge. In recent years, due to the widespread use of "Oracle" brand database management software, security issues in this field have increasingly attracted people's attention and concern. How to eliminate the security risks and vulnerabilities of the "Oracle" database is one of the most important tasks. The first thing to make clear is that the "Oracle" database system is a relational database management software developed by the American Oracle Corporation.

Apr 18, 2023 am 09:06 AM

Oracle SGA setup methods and precautions

Oracle SGA (System Global Area) is the most important system memory area in Oracle database. It contains all the memory structures required when the database instance is running, such as data cache, shared pool, redo log buffer, etc. Correctly setting up SGA has a great impact on database performance and can significantly improve query and transaction processing speeds. This article will introduce the setting methods and precautions for Oracle SGA. 1. SGA components in Oracle SGA mainly include the following

Apr 18, 2023 am 09:06 AM

Detailed examples of Oracle stored procedures and if nesting

An Oracle stored procedure is a precompiled program stored in the database that can be called by multiple users and shared between multiple applications. In Oracle stored procedures, the if statement is a frequently used conditional control statement. It can perform some operations when a condition is true and perform other operations when the condition is false. The if statement can also be nested. This There are many ways to write nested if statements, and you can choose different ways according to the actual situation. The if-else statement is the most common nested if statement, and its base

Apr 18, 2023 am 09:06 AM

How to convert rows to columns in Oracle

In Oracle database, row conversion is a common data processing requirement. It converts multiple values in a row into multiple values in a column for better presentation and analysis of data. For example, let's say we have the following table: | ID | Name | Score1 | Score2 | Score3 || --- | --- | --- | --- | --- || 1 | John | 80 | 70 | 90 || 2 | Lily | 90 | 8

Apr 18, 2023 am 09:06 AM

How to install oracle command line

Oracle is one of the most popular relational databases. It is widely used in enterprise-level applications and web applications. In this article, we will learn how to install Oracle database on command line interface. The files you need to download to download the Oracle database installation package are provided on the Oracle official website. You can directly download the corresponding version of the Oracle code installation package. It is recommended to choose to install the latest version. Each version has a corresponding download link. Here are some download links: Oracle 18c (Linux x86-64

Apr 18, 2023 am 09:06 AM

What to do if c oracle garbled code

c The solution to the oracle garbled problem often involves the Oracle database when developing databases. However, when using Oracle database, we sometimes encounter some problems. For example, when we read data from the Oracle database, garbled characters may appear, which brings great trouble to our development work. In this article, we will discuss the problem of c oracle garbled characters and provide corresponding solutions so that we can better solve this problem. The reason for garbled characters is in c language, using OCI

Apr 18, 2023 am 09:06 AM

How to solve Chinese garbled characters in Linux oracle

When Linux systems and Oracle databases are run in a Chinese environment, Chinese garbled characters sometimes appear. This situation is very troublesome, because Chinese garbled characters not only affect the viewing of data, but also affect the storage and operation of data. This article will introduce how to solve the problem of Chinese garbled characters in Linux systems and Oracle databases. 1. Handling Chinese garbled characters in Linux system The configuration of the Chinese environment of the Linux system is very important to solve the problem of Chinese garbled characters. First, you need to confirm whether the Chinese fonts are installed on the Linux system. Use the command `fc-lis

Apr 18, 2023 am 09:06 AM