Skip to main content

SQLSERVER_10: Select Command

There is only one command to retrieve data back from the table and it is known as “Select”.

Select can be used with different operators. Following are the different formats of Select command that can be used:

Ø  Select * from Dept
To Select all columns and all rows from Dept table

Ø  Select Deptno, Dname from Dept
To Select Column Deptno and Dname from Dept table

Ø  Select Deptno * 10 as 'Calculated Deptno' from Dept
This will multiply Deptno with 10 and the name of the column displayed will be ‘Calculated Deptno’

Ø  Select * from Dept where Deptno=10
To select all rows where Deptno is equal to 10

Other Examples of Select Query

Ø  Select * from Dept where Dname = 'MARKETING'
Ø  Select * from Dept where Deptno=10 or Loc = 'BOSTON'
Ø  Select * from Dept where Deptno=10 and LOC ='BOSTON'
Ø  Select * from Dept where Deptno between 10 and 30
Ø  Select * from Dept where Deptno in (10,20)
Ø  Select * from Dept where Deptno not in (10,20)
Ø  Select * from Dept where Loc is null
Ø  Select * from Dept where Loc is not null


Comments

Post a Comment

Popular posts from this blog

SQLServer Error: 15404, Could not obtain information about Windows NT group/user Error code 0x5. [SQLSTATE 42000] (ConnIsLoginSysAdmin)

If we encounter this error "SQLServer Error: 15404, Could not obtain information about Windows NT group/user Error code 0x5. [SQLSTATE 42000] (ConnIsLoginSysAdmin)" in SQL Server in which the job fails because of the user account related problem, then we need to take the following steps to make it work: a. Go to SQL Server Agent. b. Then select the job which is giving error and not running successfully. c. Then choose properties and in the General Tab, change the owner to "SA" or any account that has the administrative privileges. The problem will be resolved.
1 comment
Read more

Connecting Nodejs to SQL Server with Knex ORM - Part 1

Normally we connect Nodejs to the databases like SQLite, MongoDB, Postgres etc . In this multiple part post, I am going to show you, how we can connect Nodejs with Microsoft's SQL Server using Knex and run CRUD operations. 1. Installation of required packages In order to connect Nodejs to SQL Server with Knex, we will need following node packages installation: i. npm install knex ii. npm install mssql Once the packages are installed, we can write the following code to connect: //Code to KNEX connection settings. var knex = require('knex')({ client: 'mssql', connection: { user: 'sa', password: 'pwd', server: 'localhost', database: 'Test' } }); //Code to query the Table DEPT knex.select("*").from("dept") .then(function (depts){ depts.forEach((dept)=>{ //use of Arrow Function console.log({...dept}); }); }).catch(function(err) { ...
Post a Comment
Read more

How to use QueryExtenderControl in ASP.NET with LINQ

Queryextender control is a control that helps in doing actions like filtration, searching, sorting etc. on the LINQ Data source with few steps. In fact we don’t have to write any code with this. Screenshot given below is just an example that can easily be achieved through this control. In the above screenshot, we can see that there is a GridView Control that has been binded to a LINQData Source Control. And we have a DropDownlistBox that is also binded to another LINQData Source Control and displaying only grouped jobs. The GridView display all the employees who are matching the Job Parameter. This is done through QueryExtender Control. Also we can search for any name in the employee name's through Query Extender control. The code in the HTML goes like: < form id ="form1" runat ="server">     < div >         Select Job: < asp : DropDownList ID ="Job" runat ="server" DataSourceID ="LinqDataSource2...
Post a Comment
Read more