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Is COUNT(rowid) Faster Than COUNT(*)? 05/18/2020

It is believed that count(*) expands to all columns and that count(rowid) is faster.  Read on to see why the opposite might be true.

Understanding Views in SQL 04/27/2020

Learn about the concept of views in SQL, and how they work. Read on to see clear examples of how to implement views.

A Look at the Oracle Group-by Bug 04/13/2020

In Oracle 12.2 and later a group-by elimination enhancement can produce wrong results. Read on to see what can be returned and how to work around it.

Addressing the Drop Column Bug in Oracle 18c and 19c 02/24/2020

The latest two versions of Oracle can throw an error when columns are set as unused and then dropped. Learn about this issue and how to address it.

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Topic By Replies Updated
Oracle Data Mining: Classification jan.hasller 0 July 5th, 07:19 AM
Find duplicates - Unique IDs Lava 5 July 2nd, 08:30 AM
no matching unique or primary key rcanter 1 April 25th, 12:32 PM
Update values of one table based on condition of values in other table using Trigger Gladiator 3 February 29th, 06:01 PM