Frequently asked basic and advanced Top 80 + SQL Queries Interview Questions and Answers with Examples for Business Analyst, Data. Top 50 Basic SQL Interview Questions And Answers pdf will mainly contain Having Clause is only used with the GROUP BY function in a query whereas. a query. Download SQL Server interview questions and answers pdf. 3. What do you understand by a view? What does the WITH CHECK OPTION clause for a.
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SQL Queries Interview Questions and Answers - Query Examples - Download as PDF File .pdf), Text File .txt) or read online. SQL Queries Interview Questions. Complex SQL queries examples with answers,Complex SQL Queries,Advanced SQL Queries,Complex SQL Queries Click here to get 20 interview questions on Perforance Tuning. . Register for free and Get SQL Interview Questions PDF ：. Are you looking for Complex SQL Queries jobs? We provide you with the complete Complex SQL Queries interview Question and Answers on our page.
DCL commands are used to create roles, grant permission and control access to the database objects. What is an Index?
An index is used to speed up the performance of queries. It makes faster retrieval of data from the table. The index can be created on one column or a group of columns.
What are all the different types of indexes? 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?
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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. Disadvantage: The only disadvantage of Stored Procedure is that it can be executed only in the database and utilizes more memory in the database server.
List all the types of user-defined functions?
Answer: There are three types of user-defined functions, namely: Scalar Functions Inline Table-valued functions Multi-statement valued functions Scalar returns the unit, variant defined the return clause. Other two types of defined functions return table.
What do you mean by Collation? Answer: Collation is defined as a set of rules that determine how data can be sorted as well as compared. Character data is sorted using the rules that define the correct character sequence along with options for specifying case-sensitivity, character width etc.
What are the different types of Collation Sensitivity? Answer: Following are the different types of collation sensitivity: Case Sensitivity: A and a and B and b. Kana Sensitivity: Japanese Kana characters.
Width Sensitivity: Single byte character and double-byte character. Accent Sensitivity.
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What are the different authentication modes in SQL Server? How can it be changed? Then select the server from the Tools menu. What is a Data warehouse? Answer: Datawarehouse refers to a central repository of data where the data is assembled from multiple sources of information. Those data are consolidated, transformed and made available for the mining as well as online processing.
Warehouse data also have a subset of data called Data Marts.
What are Local and Global variables? Answer: Local variables: These variables can be used or exist only inside the function. These variables are not used or referred by any other function. Global variables: These variables are the variables which can be accessed throughout the program.
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Global variables cannot be created whenever that function is called. How can you fetch alternate records from a table? Answer: You can fetch alternate records i.
When are we going to use truncate and delete? 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.Null values allowed.
PDF will be available soon. 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.
Increased speed and flexibility of queries. Hope this article will help you to take a quick practice whenever you are going to attend any interview and not have much time to go into the deep of each query, but if you have good time to prepare then I suggest you to read and solve SQL queries from Joe Celko's SQL Puzzles and Answers , Second edition, one of the best book for SQL query lovers and enthusiastic. String Related Basic Queries for year exp. Set of rules that restrict the values of one or more columns of the tables based on the values of the primary key or unique key of the referenced table.
ALIAS name can be given to any table or a column. Click here to get 20 interview questions on Perforance Tuning..