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ORACLE Rank, Dense_rank, row_number

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SQL> desc user_order;
Name                                      Null?    Type
----------------------------------------- -------- ----------------------------
REGION_ID                                          NUMBER(2)
CUSTOMER_ID                                        NUMBER(2)
CUSTOMER_SALES                                     NUMBER
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SQL> select * from user_order order by customer_sales;
REGION_ID CUSTOMER_ID CUSTOMER_SALES
---------- ----------- --------------
         5           1              151162
        10          29             903383
         6           7     &nb


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Oracle Process Structure
Oracle takes advantage of various types of processes:
¡¡—User process: Started at the time a database user requests connection to the Oracle server
  —Server process: Connects to the Oracle instance and is started when a user establishes a session
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