Sql Server Interview Questions

1. Explain about SQL?

It is an interactive and programming language which is used to modify, manage, and to pass queries. It is an ANSI and ISO compliant language. SQL entirely depends upon its command language for modifications, changes, updating, etc to the database. Databases can also be accessible remotely with the help of Call level interface.

2. Explain about Call level interface present in SQL?

In depth explanation of this interface is present in ISO/IEC 9075-3:2003. This extension defines components which can be used to execute SQL statements written in other programming languages. This extension is defined in such a way that the statements and procedure calls from SQL be different from the applications source code.

3 Explain about the object language binding?s extension?

This extension is very useful if you are planning to use SQL in Java. This extension defines the syntax and procedure to follow for SQL embedded in Java. It also makes sure of the syntax and procedures to follow which ensures the portability of SQL embedded Java in binary applications.

4. Explain about SQL related to RDBMS?

SQL is known as structured query language. It is especially designed to retrieve and store information of data in relational database management systems. It creates, modifies and makes the data base object user access the control system. It is primarily specialized software for RDBMS.

5. Explain about the original design and basics which gave life to SQL?

SQL was originally designed to be a declarative and data manipulation language. Additions to the language occurred because of addition of new features from vendors such as constructs, data types, extensions and control flow statements. Important extensions were added to SQL. Cross platform compatibility has been the main issue for SQL.

6. Explain about XML related specifications?

XML is a very powerful DOM language. Often this language is used with many databases applications as a front end, SQL acts as a backend to support the Database queries. This specification has several extensions which defines routines, functions, data type mappings, storage, etc.

7. State the several languages into which SQL is divided into?

SQL is divided into several sub divisions such as
? Statements
? Queries
? Expressions
? Predicates
? Clauses
? White space
? Statement terminator

8. Explain about the information and definition schemas?

This information and definition schema helps the user by giving necessary information about the tools and functions of SQL. It describes several tools and extensions some of them are object identifier, security, features provided by DBMS, authorization, values, sizing items, etc. This is defined by ISO specification.

9. Explain the where clause?

Where clause has a comparison predicate which restricts the number of rows as per the user generated query. This clause should be applied before the GROUP BY clause. This clause functions with the help of comparison predicate, when a comparison predicate does not evaluate a result to be true, all rows from the end result are deleted.

10. Explain about predicates and statements?

Statements have a prolonged effect on the functioning and behavior of the data, care should be taken before defining a statement to the data. It may control transactions, query, sessions, connections and program flow Predicates specified conditions which can be evaluated to three valued logic. Boolean truth values can limit the effect of the statements, program functioning, queries, etc.

11 Explain about data retrieval?

Data retrieval syntax is often used in combination with data projection. This mechanism is used when there is a need for calculated result. This is used when there is a special need for calculated data and not the verbatim data, which is different from the way it was stored in the database.

12. Explain the ORDER BY clause?

Orderby clause identifies the columns which are used to sort the data and the order in which they should be sorted out. SQL query needs to specify orderly clause of they want the data to be returned in a defined manner of rows and columns.

13. Explain about the MERGE field?

MERGE is used when you need to combine more than one table for a user generated query. This field can be aptly said as a combination of INSERT and UPDATE elements. This field is also given a different name (upsert) in some versions of SQL.

14. Explain about Data definition?

Data definition Language is used to define new tables and elements associated with it. Some of the basic data definition language elements are CREATE, TRUNCATE, ALTER, RENAME, etc. These are used to control the non standard features of the database.