Useful tips for everyday
How do you map a many-to-many relationship in hibernate? In order to map a many-to-many association, we use the @ManyToMany, @JoinTable and @JoinColumn annotations. Let’s…
Can we use subquery in UPDATE? UPDATE operations with subqueries that reference the same table object are supported only if all of the following conditions…
Is there a problem with using a case in an UPDATE statement? I know this is a very old question and the problem is marked…
How do I create a server on pgAdmin? Create new local server in pgadmin? in pgAdmin, right click ‘Servers’ and go Create>Server. On the ‘Create…
What kind of measures are facts in a fact table? The primary key of a fact table is usually a composite key that is made…
What is the difference between concat and Group_concat in MySQL? Answer: Similar to CONCAT, MySQL GROUP_CONCAT is also used to concatenate values across a table.…
How long index rebuild takes? index rebuild time taken 4 hours. What happens when we rebuild index in Oracle? Oracle provides a fast index rebuild…
What is database compatibility? Database compatibility level was mainly used as a mechanism to control whether new features introduced in that version could be used…
Can SQL Server 2008 R2 run on Windows Server 2012? SQL 2008 R2 is supported on Windows 2012 but you need to apply the latest…
Why does PostgreSQL say relation does not exist? As you did not have a table (dubbed ‘relation’ in the error message), it threw the not-found…