Are ROWNUM and ROWID the same column?
No. In Oracle DBMS, ROWNUM and ROWID are pseudocolumns that can be accessed in SQL queries, but they aren’t the[…]
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Using a recursive query to create a list of dates
In enterprise database systems, one may commonly find business events (e.g. sales, revenue, etc) associated to dates or months. In[…]
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Filtering data in SQL using Where and Having
The Where clause is one of the mostly commonly used clauses in the SQL language. On the other hand, the[…]
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Getting date and time parts from DateTime and SmallDateTime fields
Microsoft SQL Server supports several data types that can be used to store dates and times. Although some of them[…]
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Database Users and Schemas – concepts and tricks
There is some confusion when dealing with some users and schemas. Some DBMS support several schemas per database, while other[…]
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ORA-01033: ORACLE initialization or shutdown in progress
If you get ORA-01033 error, it means that the Oracle instance you are accessing is being started or shutdown. Then,[…]
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Split brain in Oracle RAC?
In Oracle Real Application Clusters (RAC), two or more instances of an Oracle DBMS manage a single database. It means[…]
Read moreWelcome to Database Tips.Net
Database Tips.net aims to be a useful repository for DBMS users of all skill levels. We presente database tips and[…]
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