Useful tips for everyday
What is hierarchical attribute? A hierarchical attribute represents an entire hierarchy and its levels (for example, Time includes levels of Year, Quarter, Month, and Day).…
How does view help database performance? Views make queries faster to write, but they don’t improve the underlying query performance. In short, if an indexed…
How does Oracle database Vault work? About This Tutorial. Step 1: Create Users for This Tutorial. Step 2: Enable the OE User Account. Step 3:…
Can you select from a stored procedure? If your sproc is literally just a wrapper for a query that has no dependencies on parameters, then…
How do I find my SSH login history? To view the history of all the successful login on your system, simply use the command last.…
How do I connect to a local instance of Oracle SQL Developer? Configure Oracle SQL Developer Cloud Connection Run Oracle SQL Developer locally. The Oracle…
What is text data type in SQL? In this article ntext, text, and image data types will be removed in a future version of SQL…
What is LEFT OUTER JOIN in MySQL? MySQL Left Join. MySQL Left Join or Left outer join is used to return all the records (or…
Why are NULL values needed in the relational model? Null or NULL is a special marker used in Structured Query Language to indicate that a…
How do I create a unique foreign key in SQL? To create a SQL foreign key constraint, the parent table should have primary key column…