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- how to learn sql
- How to learn sql: first you need to master certain basic knowledge of database; then you need to find some sql exercises to do; finally you need to learn advanced sql usage and techniques. sql is a database query and programming language used to access data and query, update and manage relational database systems.
- SQL 18867 2020-09-16 10:00:14
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![[SQL Learning] The connection between ordered index and order by](https://img.php.cn/upload/article/000/000/031/5cb7e1f38d83c422.jpg?x-oss-process=image/resize,m_fill,h_100,w_220)
- [SQL Learning] The connection between ordered index and order by
- Under normal circumstances, there are two implementation methods for order by. One is to automatically implement it using an ordered index. That is to say, using the orderliness of the ordered index does not require additional sorting operations. The other is to sort the results after selecting them. Using an ordered index is of course the fastest, but there are some restrictions. Let’s take a look at the test below.
- SQL 4488 2019-05-24 15:17:33
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- Xiaobai's second level of learning Oracle: Creation of the first Oracle database table
- Nowadays, in actual work, creating tables in the database is often used. In this article, the editor mainly shares with you how to create tables in the database through SQL statements. First, use plsql to connect to the oracle database and ensure that the following services are enabled.
- SQL 4565 2019-05-24 15:16:38
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- ORACLE user rights management
- Today I will take you to learn about ORACLE's user rights management. Creating new users can only be done by Oracle's DBA administrator.
- SQL 5602 2019-05-24 15:16:00
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