Skip to main content

How to Retrieve Specific Records by SQL Database: SQL Server

By-default when user fire a query on the sql database it provides all the columns in the output, the table have. Database developer can change the no. of columns, to be displayed in the output. Sql Server Management Studio provides some special features explained in the article.

Retrieving Specific Attributes

While retrieving data from tables, you can display one or more columns. For example, the Adventure Works database stores the department details, such as Name and GroupName in the Department table. Users might want to view single column such as Name. Programmer can retrieve the required data from the database tables by using the SELECT statement.

The SELECT statement is used for accessing and retrieving data from a database. The syntax of the SELECT statement is:

SELECT [ALL | DISTINCT] select_column_list
[INTO [new_table_name]]
[FROM {table_name |view_name}
[WHERE search condition]


  • ALL: represented with an (*) asterisk symbol and displays all the columns of the table.
  • Select_column_list: name of the table from which data is to be retrieved.
The SELECT statement can contains some more arguments such as WHERE, GROUP BY, COMPUTE, and ORDER BY that will be explained in later articles. All the examples in this SQL related articles are based on the Adventure Works Database, and can be download from here.
Consider the department table stored in the HumanResources schema of the Adventure Works database. To display all the detail of employees, you can use the following query:

SELECT * FROM HumanResources.Department

Execute the query and SQL Server will display the output of the query, as shown in the following figure.

How to Retrieve Specific Records by SQL Database: SQL Server 
The result set displays the records in the order in which they are stored in the table. In other words the records are sorted in ascending order of DepartmentId that is primary key of the department table.

The number of rows in the output window may vary depending on the modifications done on the database.
If you need to retrieve specific columns, you can specify the column names in the SELECT statement. For example, to view specific details, such as only Name of the employees of AdventureWorks, you can specify the column names in the SELECT statement, as shown in the following SQL query:
SELECT DepartmentId, Name FROM HumanResources.Department

The SQL Server will display the output of the query, as shown in the following figure.

How to Retrieve Specific Records by SQL Database: SQL Server 
In the output, the result set shows the column names the way they are present in the table definition. You can customize these column names, if required. As same as in above sql query you can specify some more columns as per the requirements.

Customizing and Concatening display in SQL Server


Popular posts from this blog

difference between structure and union in C Language

In c language article we will see the difference between union and structure. Both are the user define datatype in c language. See the table which is mentioned below: ASP.NET Video Tutorial Series Structure Union1.The keywordstruct is used to define a structure 1. The keyword union is used to define a union. 2. When a variable is associated with a structure, the compiler allocates the memory for each member. The size of structure is greater than or equal to the sum ofsizes of its members. The smaller members may end with unused slack bytes. 2. When a variable is associated with a union, thecompiler allocates thememory by considering the size of the largest memory. So, size of union is equal to the size of largest member. 3. Each member within a structure is assigned unique storage area of location. 3. Memory allocated is shared by individual members of union. 4. The address of each member will be in ascending order This indicates that memory for each member will start at different offset v…

Difference between Linear search and Binary Search in c language

SQL Video Channel : Download all SQL Video

Binary Search Linear Search Works only on sorted items. such as  1,2,3,4,5,6  etc
Works on sorted as well as unsorted items. 12,4,5,3,2,1 etc Very efficient if the items are sorted Very efficient if the items are less and present in the beginning of the list. such as Suppose your list items are : 12,3,4,5,1 and you want to search 12 number then you get beginning in the list. Works well with arrays and not on linked lists. Works with arrays and linked lists.
Number of comparisons are less More number of comparisons are required if the items are present in the later part of the array or its elements are more.

Memory representation of Linked List Data Structures in C Language

Memory representation of Linked List

             In memory the linked list is stored in scattered cells (locations).The memory for each node is allocated dynamically means as and when required. So the Linked List can increase as per the user wish and the size is not fixed, it can vary.

               Suppose first node of linked list is allocated with an address 1008. Its graphical representation looks like the figure shown below:

      Suppose next node is allocated at an address 506, so the list becomes,

  Suppose next node is allocated with an address with an address 10,s the list become,

The other way to represent the linked list is as shown below:

 In the above representation the data stored in the linked list is “INDIA”, the information part of each node contains one character. The external pointer root points to first node’s address 1005. The link part of the node containing information I contains 1007, the address of next node. The last node …