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[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.
Apr 18, 2019 am 10:43 AM
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.
Apr 10, 2019 pm 06:00 PM
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.
Apr 09, 2019 pm 12:06 PM
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