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- How to query oracle username and password
- In Oracle database, each user has his own username and password. If you need to query the username and password of a user, you can do so through the following methods: 1. Use the SQL*Plus command line tool to query In Oracle, you can use the SQL*Plus command line tool to query the username and password. Open SQL*Plus and enter the following command:```SQL> SELECT username, password FROM dba_users WHERE us
- Oracle 21282 2023-04-04 09:54:56
- How to create a simple stored procedure in oracle to create a table
- Oracle Stored Procedure Create Table In Oracle Database, a stored procedure is a reusable database object that can be called like a subroutine. Stored procedures are typically used to perform a series of database operations such as inserting, updating, deleting, and querying data. When developing Oracle database applications, stored procedures are a very important tool that can improve code reusability and performance. In this article, we will explore how to create a simple stored procedure to create a table. The process of creating a table usually involves specifying the table name, column name, number
- Oracle 1194 2023-04-04 09:48:31
- Detailed explanation of the method of escaping single quotes in Oracle
- Single quote escaping in Oracle means that when using SQL statements, if you need to insert or query a string containing single quotes, you need to escape the single quotes, otherwise syntax errors or data errors will occur. This article will introduce the method of escaping single quotes in Oracle. 1. Use double single quotes instead of single quotes The most common escaping method is to use two single quotes instead of one single quote. This is because single quotes are used in SQL statements to indicate the beginning and end of strings. If you need to insert a single quote into the string, you need to add another one before the single quote.
- Oracle 4712 2023-04-04 09:48:43
- How to set timeout in Oracle database
- Oracle database is a very popular relational database, but during use, we often encounter the problem of database connection timeout. This problem may lead to data transmission interruption, performance degradation and a series of troubles. So, how to set the timeout in Oracle database? This article will introduce you to the specific method. 1. The principle of timeout setting In Oracle, the timeout period is realized through SQLnet read and write timeout parameters. SQLnet is a network component of the Oracle database that provides
- Oracle 4452 2023-04-04 09:49:47
- How to remove Oracle RAC
- Oracle RAC is a powerful data management technology that allows multiple computers to access and use the database simultaneously. While Oracle RAC is a great technology, there are times when Oracle RAC needs to be removed for maintenance or updates. In this article, we will discuss how to remove Oracle RAC. Before removing Oracle RAC, you should back up all data. Depending on your configuration, you may need to back up data on all computers. Backing up your data ensures that your data is not lost during the deletion process. this
- Oracle 985 2023-04-04 09:50:01
- How to call the stored procedure of Oracle database using C language
- When developing software, you often need to operate the database. The stored procedures of Oracle database are one of the very important functions. Through stored procedures, we can encapsulate some common business logic into a reusable code library, simplifying the development and maintenance of the code. This article will introduce how to use C language to call the stored procedure of Oracle database. 1. Preparation work Before starting to write C programs, you need to install the Oracle database and Oracle client. If you have already installed the Oracle client, you can
- Oracle 831 2023-04-04 09:51:45
- How to convert Oracle case to case
- In Oracle database, case conversion usually refers to converting the case of certain data or objects. In the Oracle database, the names and values of some objects and data are case-sensitive, such as table and column names, variable names, function names, etc. This means that if you use uppercase names in one place, and call the object or data with lowercase names in another place, an error will be prompted. For example, in the following SQL statement, an error will occur when company_id and COMPANY_ID are confused:```SELECT
- Oracle 5907 2023-04-04 09:52:17
- Let's talk about Oracle output parameter stored procedure
- In Oracle database, a stored procedure is a precompiled block of code that can perform defined operations by calling the stored procedure when needed. In a stored procedure, in addition to executing SQL statements, you can also define parameters for input, output, or both. This article mainly introduces the output parameters and their applications in stored procedures. 1. The concept of output parameters In a stored procedure, an output parameter is a variable used to return results from the stored procedure, usually including basic data types and custom data types. When the stored procedure is executed, the return result will be saved in the output
- Oracle 1475 2023-04-04 09:44:03
- How to delete a table in Oracle database
- Oracle Database is a widely used enterprise-level relational database management system that is widely popular for its high reliability, security, and performance. When using Oracle database, you often need to perform table operations, such as creating, modifying, and deleting tables. In this article, we will discuss how to delete tables in Oracle database. There are two ways to delete a table in an Oracle database: using SQL Developer tools and using SQL statements. Below we will introduce both methods in detail. 1. Use SQL Deve
- Oracle 3767 2023-04-04 09:44:33
- How to modify the number of connections in Oracle database
- Oracle Modifies the Number of Connections Oracle database is one of the more popular databases at present. It has the characteristics of high reliability, high stability and high security, and is widely used in enterprise-level applications. When using Oracle database, we often need to modify its number of connections to meet the needs of the application. This article will introduce how to modify the number of connections in Oracle database. 1. Check the current number of database connections. Before modifying the number of database connections, we first check the current number of database connections. We can use the following command to view the current Ora
- Oracle 2423 2023-04-04 09:46:06
- How to query a user's tablespace through Oracle SQL
- Oracle query user table space table space is the basic unit of Oracle database management data. In Oracle database, both user data and system data are stored in table spaces. When we create a user, we need to allocate a tablespace for this user. Therefore, when managing an Oracle database, it is often necessary to query the user's table space and the usage of the table space. This article will introduce how to query the user's table space through Oracle SQL. In Oracle database management, table spaces divide the database into several logical areas.
- Oracle 5139 2023-04-04 09:47:07
- Share the installation process of Oracle 11g database
- Oracle 11g is a powerful relational database management system. If you need to use Oracle 11g on your local machine, you will need to install it. This article will introduce the installation process of Oracle 11g database. 1. Download the Oracle 11g installation file. You need to go to Oracle's official website to download the Oracle 11g installation file. The installation file size is approximately 2GB. Please make sure you select the installation file for the correct operating system version. 2. Preparations before installing the software. Install Ora.
- Oracle 905 2023-04-04 09:47:59
- How to perform common data transformations in Oracle queries
- Oracle is one of the most popular relational database management systems in the world. Its query language, SQL, is one of the must-have skills used by most database administrators and developers. However, in Oracle queries, sometimes we need to do some data conversion, such as converting uppercase letters to lowercase letters or vice versa. In this article, we will discuss how to perform common data transformations in Oracle queries. 1. Convert letters to upper and lower cases. Sometimes we need to convert letters in a column to upper and lower cases. This can be done by using Oracle's built-in L
- Oracle 1090 2023-04-04 09:38:05
- How to modify records in oracle
- Oracle Database is a relational database management system widely used in enterprise-level applications, and it is one of the most popular databases on the market today. In daily business operations, it is often necessary to modify database records, so it is very important to understand the modification process of Oracle database records. This article will introduce the relevant knowledge of Oracle modification records. First, we need to understand the basic structure of Oracle database. Oracle database contains multiple tables (Table), each table contains multiple columns
- Oracle 1522 2023-04-04 09:41:09
- Focus on the output parameters of Oracle stored procedures
- Oracle stored procedures are a set of precompiled SQL statements that can be executed in the database. Using stored procedures can simplify the execution of repetitive tasks, improve the efficiency of SQL statement execution, and can be used to process large amounts of data, thereby improving database performance. Stored procedures can accept parameters as input and can also provide parameters as output. Among them, the output parameter of the stored procedure can be one or more, and can return a single or multiple values. This article will focus on the output parameters of Oracle stored procedures. 1. The definition of output parameters is in
- Oracle 2044 2023-04-04 09:41:38
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