What are the oracle code segment comment symbols?-Oracle-php.cn

Home

Database

Oracle

What are the oracle code segment comment symbols?

藏色散人

Oct 16, 2020 am 11:10 AM

oracle

Oracle code segment comment symbols start with "/*" and end with "*/". The comment method is such as "/*IF 2 2 = 4 THEN some_condition := TRUE; END IF;*/".

What are the oracle code segment comment symbols?

Recommended: "oracle tutorial"

Comments in Oracle PL/SQL code

Comments on Oracle PL/SQL code can be divided into two types:

- 单行注释
- 多行注释

Single-line comments start with "--", for example:

-- DELETE FROM employees WHERE comm_pct IS NULL

Multi-line comments start with "/ *" and ends with "*/", for example:

/*
 IF 2 + 2 = 4 THEN
        some_condition := TRUE; 
    END IF; 
*/

However, multi-line comments cannot be nested within multi-line comments, for example:

/*
     IF 2 + 2 = 4 THEN
        some_condition := TRUE;
     /* We expect this THEN to always be performed */ 
    END IF;
 */

This is not allowed and a syntax error will be reported. . However, single-line comments can be included within multi-line comments, for example:

/* 
  IF 2 + 2 = 4 THEN
    some_condition := TRUE; 
 -- We expect this THEN to always be performed
  END IF; 
*/

This is allowed. However, multi-line comments can contain the starting characters of multi-line comments, for example:

/* 
  IF 2 + 2 = 4 THEN
    some_condition := TRUE; 
 /* We expect this THEN to always be performed
  END IF; 
*/

This is also allowed. But it cannot contain ending characters, for example:

/* 
  IF 2 + 2 = 4 THEN
    some_condition := TRUE; 
 We expect this THEN to always be performed */
  END IF; 
*/

This is not allowed and there is a syntax error

The above is the detailed content of What are the oracle code segment comment symbols?. For more information, please follow other related articles on the PHP Chinese website!

Statement

The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

What Does Oracle Offer? Products and Services ExplainedApr 16, 2025 am 12:03 AM

Oracleoffersacomprehensivesuiteofproductsandservicesincludingdatabasemanagement,cloudcomputing,enterprisesoftware,andhardwaresolutions.1)OracleDatabasesupportsvariousdatamodelswithefficientmanagementfeatures.2)OracleCloudInfrastructure(OCI)providesro

Oracle Software: From Databases to the CloudApr 15, 2025 am 12:09 AM

The development history of Oracle software from database to cloud computing includes: 1. Originated in 1977, it initially focused on relational database management system (RDBMS), and quickly became the first choice for enterprise-level applications; 2. Expand to middleware, development tools and ERP systems to form a complete set of enterprise solutions; 3. Oracle database supports SQL, providing high performance and scalability, suitable for small to large enterprise systems; 4. The rise of cloud computing services further expands Oracle's product line to meet all aspects of enterprise IT needs.

MySQL vs. Oracle: The Pros and ConsApr 14, 2025 am 12:01 AM

MySQL and Oracle selection should be based on cost, performance, complexity and functional requirements: 1. MySQL is suitable for projects with limited budgets, is simple to install, and is suitable for small to medium-sized applications. 2. Oracle is suitable for large enterprises and performs excellently in handling large-scale data and high concurrent requests, but is costly and complex in configuration.

Oracle's Purpose: Business Solutions and Data ManagementApr 13, 2025 am 12:02 AM

Oracle helps businesses achieve digital transformation and data management through its products and services. 1) Oracle provides a comprehensive product portfolio, including database management systems, ERP and CRM systems, helping enterprises automate and optimize business processes. 2) Oracle's ERP systems such as E-BusinessSuite and FusionApplications realize end-to-end business process automation, improve efficiency and reduce costs, but have high implementation and maintenance costs. 3) OracleDatabase provides high concurrency and high availability data processing, but has high licensing costs. 4) Performance optimization and best practices include the rational use of indexing and partitioning technology, regular database maintenance and compliance with coding specifications.

How to delete oracle library failureApr 12, 2025 am 06:21 AM

Steps to delete the failed database after Oracle failed to build a library: Use sys username to connect to the target instance. Use DROP DATABASE to delete the database. Query v$database to confirm that the database has been deleted.

How to create cursors in oracle loopApr 12, 2025 am 06:18 AM

In Oracle, the FOR LOOP loop can create cursors dynamically. The steps are: 1. Define the cursor type; 2. Create the loop; 3. Create the cursor dynamically; 4. Execute the cursor; 5. Close the cursor. Example: A cursor can be created cycle-by-circuit to display the names and salaries of the top 10 employees.

How to export oracle viewApr 12, 2025 am 06:15 AM

Oracle views can be exported through the EXP utility: Log in to the Oracle database. Start the EXP utility, specifying the view name and export directory. Enter export parameters, including target mode, file format, and tablespace. Start exporting. Verify the export using the impdp utility.