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Top 60 Advanced SQL Interview Questions And Answers Pdf, You can crack the interview to achieve your echecs16.info Provide Tutorial Videos Scenario based. SQL Interview Questions with Answers A stored procedure is a named group of SQL statements that have been previously created and stored in the server. SQL Interview Questions for developers. We cover basic & advanced SQL Server Interview Questions and Answers. Read to crack SQL.
It is possible to create the index on a single column or a group of same. On the other side, a View is basically nothing but the subset of a table and is used for the purpose of storing the database in a logical manner. It is actually a virtual table that has rows as well as the columns which are similar to that of a real table. The same is considered when it comes to restricting the access of a database. It stands for Structured Query Language and is a powerful language to communicate the database and monitor the concerned tasks easily and reliably.
There are three types of indexes 1. Unique Index: Unique Indexes helps maintain data integrity by ensuring that no two rows of data in a table have identical key values. A unique index can be applied automatically when a primary key is defined.
It ensures that the values in the index key columns are unique. Clustered Index: Clustered Index reorders the physical order of the table and search based on the key values.
There will be only one clustered index per table.
Each table can have many non-clustered indexes. What is the difference between Cluster and Non-Cluster Index? The difference between the clustered and non-clustered index in SQL is as follows: Clustered Index: It is used for easy retrieval of data from the database and it is faster.
One table can only have one clustered index It alters the way records are stored in a database as it sorts out rows by the column which is set to be clustered index. Non-Clustered Index: It is slower compared to the Clustered index. What is a View? A view is like a subset of a table which is stored logically in a database.
A view is a virtual table. It contains rows and columns similar to a real table. The fields in the view are fields from one or more real tables.
Views do not contain data of their own. They are used to restrict access to the database or to hide data complexity. What are the advantages of Views? Some of the advantages of Views are Views occupy no space Views are used to simply retrieve the results of complicated queries that need to be executed often.
Views are used to restrict access to the database or to hide data complexity. What is a relationship and what are they? Database Relationship is defined as the connection between the tables in a database.
There are various database relationships namely 1. One to One Relationship 2. One to Many Relationship 3. Many to One Relationship 4. Self-Referencing Relationship What is a query? A database query is a request for data or information from a database table or combination of tables.
A database query can be either a select query or an action query. What is a Subquery?
A Subquery is a SQL query within another query. It is a subset of a Select statement whose return values are used in filtering the conditions of the main query.
Question 23 What do you mean by Subquery? Query within another query is called as Subquery. A subquery is called inner query which returns output that is to be used by another query.
Question 24 How many row comparison operators are used while working with a subquery? Question 25 What is the difference between clustered and non-clustered indexes?
One table can have only one clustered index but multiple nonclustered indexes. Clustered indexes can be read rapidly rather than non-clustered indexes.
Question 28 How to write a query to show the details of a student from Students table whose name starts with K? Subquery within another subquery is called as Nested Subquery. If the output of a subquery is depending on column values of the parent query table then the query is called Correlated Subquery. Question 30 What is Normalization? How many Normalization forms are there? Normalization is used to organize the data in such manner that data redundancy will never occur in the database and avoid insert, update and delete anomalies.