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Differentiate between a Global and a Local temporary table?
- A local temporary table exists only for the duration of a connection or if defined inside a compound statement, for the duration of compound statement.
- Global temporary tables (created with a double "##") are visible to all sessions.
- Global temporary tables are dropped when the session which created it ends and all other sessions have stopped referencing it.
What's the difference between a primary key and a unique key? Both primary key and unique key enforces uniqueness of the column on which they are explained. But by default prim
Attributes and its types explain?
Concatenation operator Example : Printing name and job as one string as column name employees: SELECT ENAME||JOB "EMPLOYEES" FROM EMP;
What is Collation Collation is a kind of sort order. There are majorly 3 types of sort orders, namely: i.) Dictionary case insensitive ii.)Dictionary - case sensitive
It defines that the tuple in one relation that refers to another relation must refer to an existing tuple in that relation. This constraint is states on two relations (not essentia
The Database Approach In order to overcome the limits of a file system, a new approach was needed. Hence a database approach emerged. A database is a persistent collection of
What is Nested Trigger? A trigger can also having INSERT, UPDATE and DELETE logic within itself, so when the trigger is fired because of data modification it can also cause ano
explain the level architectures of the database management system
Illustrate the view of software architecture A model is a semantically closed abstraction of system composes of elements. It can be visualized using any of the following five v
Define the term Domain. For each n every attribute there is a set of permitted values known as the domain of that attribute.
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