1 What is SQL Server?
SQL Server is a relational database management system by Microsoft. It is built on top of SQL and supported by Linux, Microsoft Windows Server, Microsoft Windows operating systems.
Microsoft SQL Server, an RDBMS primarily developed by Microsoft. As a database server, it is only a software product intended to store and recover data as required by many other software applications — that can be run on the same computer or on another networked computer. Microsoft SQL Server is engineered for a variety of audiences and workloads ranging from small single applications - computer new to large internet applications - to multi-user applications simultaneously.
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SQL Server is a relational database management system by Microsoft. It is built on top of SQL and supported by Linux, Microsoft Windows Server, Microsoft Windows operating systems.
In order to speed up the performance of the queries, the index is used. It instantly accelerates the retrieval of data from the table and database. An index can be efficiently created over a group or one column.
There are three types of indexes in SQL
A structure which temporarily or initially stores the data or the database object is called as a template.
In the year 2005, SQL server has introduced apply operator. This is basically a joining that shows the expression of the left table with the right table expression. The expressions that are basically produced in the right table expression is after following up each row in the left table. The left table expressions are calculated in the first hand and then the right table. After following this process we can get our final set value.
In SQL, a cursor can be defined as a tool used widely to define a particular set of results. This result can be a set of data rows. A cursor is basically used to solve complex logic and works on a row by row manner.
Index, on the other hand, has the main function of retrieving data from tables much quicker. Indexes are created by users on columns that may be accessed frequently. This enables the user to get information quickly from the table and can be created on a single column or even a group.
A query is basically a request for the database or the information associated with it in the combination of tables. A query associated with the database can either be a select or an action query.
A SQL query with the other significant query is called a subquery. We can also say it as a subset of all selected states where the values are used for the filtering the results of the main query.
A database, in general, is a collection of information in a more organized form for better access. The data can be stored or executed in multiple ways and collectively they are defined as tables, views or database objects. Data warehouse refers to the medium of a repository of the data from the multiple resources. The data from the data warehouse is available to transform or even use in online processing.
The commands which are used in SQL to define the structure of database are called as DDL commands. Its types are:
In order to remove the redundant data, normalization is used. It also reduces the null values and enables the efficiency of indexing. Its different levels are:
Denormalization is the inverse process of normalization. It highly accelerates the performance of the query by reducing the join operations and also used the OLTP applications.
There is, of course, a difference between the primary and unique key
Primary key
Unique key
The commands which are used to manage the data which is present in the entire database are called as DML commands. They are of following types-
TCL commands are generally used to manage the changes which are managed priory by the DML commands.
The commands which are used to create the rules to grant the permission are known as useful commands in SQL. These commands also control the access to the database and its objects.
The subset of a table which is basically stored logically in a database is called as a view. A view is a virtual table which is containing the rows and columns. The fields located in views are similar to tables and they do not contain the date of their own. Its advantages are:
A query which retrieves the related columns from the number of tables is called as join. Its different types are:
Functions | Mysql Server | MySQL |
---|---|---|
Developer | Microsoft | Oracle |
License | commercial | open source |
Cloud based | no | no |
Implemented languages | C++ | C & C++ |
XML support | yes | yes |
Supported programming language | c Sharp, PHP, python, Java | C++, C sharp,Java, Perl |
Server side scripting | support transa scripting | yes |
Currency | it supports | yes It supports |
Transaction concepts | it supports AC | It supports ACID |
The difference between the left and right outer join is as follows:
S. N. | Left Join | Outer Join |
---|---|---|
1 | A left outer join provides the table in the FROM clause whose all rows are returned. | A right outer join allows for returning all rows from the table specified in the join clause. |
2 | A left outer join fetches the unmatched rows from the table which is on the left of the join clause. | A Right outer join fetches the unmatched rows from the table which is on the right of the join clause. |
The star schema in computing is the basic data mart schema style. It is commonly used for developing both dimensional data marts and data warehouses. It is made up of either 1 or more than one fact table. It references any of the numbers at the dimension tables. The importance of star schema to snowflake schema case can not be overstated. The handling of simpler queries is effectively carried out more with star schema. The name "star schema" is gotten from the physical shape of a star and at its centre has a fact table. It is surrounded by the dimension tables which represent the points of the star.
The SSRS stands for SQL Server Reporting Services. The SSRS IN structured query language allows an individual to develop reports that are formatted with tables. These exist in different forms such as images, data, charts, and graphs. The formatted reports are hosted on a Web server and a user can choose to execute it any time. The SSRS tool is encompassed by the SQL Server. Some of the reasons for making use of SSRS tool in SQL are:
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