Step by step perform Sql Queries – Part I
Through-out the article we will learn step-by-step: How to perform Perform Sql Queries. We will discuss crud operations with usage of Sql server Queries. I have mention Queries for Some Realtime Basic Queries.
This article is Part-I of a series of 'Step by step Perform Sql Queries'
Introduction
This article is Part-I of a series of 'Step by step Perform Sql Queries' In this article, we will discuss step-by-step implementation of sql queries using SQL Server and perform few CRUD operations.
So, what we are waiting for here, lets get started. Just following these step(s) and we will done!Step1: How to Start Sql Server
Launch SQL Server Management studio from your system. If you do not have SQL Server, get one for this article you can install Sql Express edition.
Step2:How to Connect Sql Server
From Management Studio Click on 'New Query' and open Sql Query window.
Step3:How to Create Database using Sql Query
In Design Steps To create a database
1. In Object Explorer, connect to an instance of the SQL Server Database
Engine and then expand that instance.
2. Right-click Databases, and then click New Database.
3. In New Database, enter a database name
Query
The following SQL statement creates a database called " DBTEST":
CREATE DATABASE DBTESTStep4:How to Create Table using Sql Query
CREATE TABLE tblTest
(
Id INT PRIMARY KEY IDENTITY(1,1),
EmpNo INT,
EmpName VARCHAR(20),
amount DECIMAL(18,2),
Status BIT,
Dob Datetime
)Code explanation
Primary Key must contain UNIQUE values. A primary key column cannot contain NULL values.
The table can have only ONE primary key.
Int number fields (Ex: 100,200,1500).
VARCHAR character and string value.
BIT boolean value (Ex: True or False).
DateTime DateTime values.Step5: How to Create Insert Query
-- How to Insert the Records using Sql Query with snapshots
INSERT INTO tblTest(EmpNo,EmpName ,amount ,Status ,DOB) VALUES(100,'AAA',1859.25,1,'02/02/1984')
INSERT INTO tblTest(EmpNo,EmpName ,amount ,Status ,DOB) VALUES(101,'AAA1',1900.21,1,'02/02/1985')
INSERT INTO tblTest(EmpNo,EmpName ,amount ,Status ,DOB) VALUES(102,'AAA2',2559.24,1,'02/06/1987')
INSERT INTO tblTest(EmpNo,EmpName ,amount ,Status ,DOB) VALUES(103,'AAA3',1590.23,0,'02/08/1981')
INSERT INTO tblTest(EmpNo,EmpName ,amount ,Status ,DOB) VALUES(104,'AAA4',1592.22,1,'02/03/1986')
INSERT INTO tblTest(EmpNo,EmpName ,amount ,Status ,DOB) VALUES(105,'AAA5',1889.21,0,'02/01/1981')
-- How to Select the Records using Sql Query
SELECT * FROM tblTest
Step6: How to use Select Query
-- Select the Records Based on EmpNo
SELECT * FROM Tbltest WHERE EmpNo=103
SELECT * FROM Tbltest WHERE EmpNo IN(101,103)
SELECT * FROM Tbltest WHERE EmpNo >100
Step7: How to use Update Query
-- Update the Records Based on EmpNo
Update Tbltest SET Empno = 1947 WHERE EmpNo=103
Update Tbltest SET Empno=1 WHERE EmpNo IN(101,103)
Update Tbltest SET Empno=1001 WHERE EmpNo >104
SELECT * FROM tblTest
Step8: How to use Update Query
-- Delete the Records Based on EmpNo
DELETE FROM Tbltest WHERE EmpNo=103
DELETE FROM Tbltest WHERE EmpNo IN(101,103)
SELECT * FROM tblTest
Step9: Perform alter Query in Sql Server
-- Alter New column add Table Fields
ALTER TABLE tblTest ADD RefId INT
UPDATE tblTest SET Refid=8 WHERE Empno=1001
SELECT * FROM tblTest
Conclusion
In this whole article, we discussed about SQL Query operations using SQL Query Window.
1. Create a new Table
2. Choose Authentication in Sql server window
3. Write DML and DCL Queries
4. View using Query output
5. Add various operations
Hope, you find this article helpful.
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