SELECT, INSERT, DELETE and UPDATE Statements in SQL Server

SELECT 
Select statement use to retrieve data from the table, the result is stored in a result table called Result-Set.
Syntax:
SELECT <column's name> FROM <Table Name>
Example:
IF OBJECT_ID('dbo.Employee', 'U') IS NOT NULL
       DROP TABLE Employee
CREATE TABLE Employee
(
       ID INT IDENTITY(1,1),
       FNAME VARCHAR(50),
       LNAME VARCHAR(50),
       ADDRESS VARCHAR(1000),
       CREATEDDATE DATETIME
)
INSERT INTO Employee (FNAME,LNAME,ADDRESS,CREATEDDATE) VALUES('DILIP','SINGH','DELHI',GETDATE())
INSERT INTO Employee (FNAME,LNAME,ADDRESS,CREATEDDATE) VALUES('VIPUL','BHATT','NOIDA',GETDATE())
INSERT INTO Employee (FNAME,LNAME,ADDRESS,CREATEDDATE) VALUES('RAJ','SINGH','BOKARO',GETDATE())
First, run above code, it will create the table "Employee" and also will insert  three records in table.
Select Statement
SELECT * FROM Employee
The above query will return all the columns in the result-set.
Result:

Select statement with column name
SELECT FNAMELNAMEADDRESS FROM Employee
It will return column 'FNAME','LNAME','ADDRESS' in result-set.
Result:
INSERT
Insert statement use for insert new records into the table.
Syntax:
INSERT INTO <table name> VALUES <values>
Example:
IF OBJECT_ID('dbo.Employee', 'U') IS NOT NULL
       DROP TABLE Employee
CREATE TABLE Employee
(
       ID INT IDENTITY(1,1),
       FNAME VARCHAR(50),
       LNAME VARCHAR(50),
       ADDRESS VARCHAR(1000),
       CREATEDDATE DATETIME
)
Run the above query then select the statement below.
SELECT * FROM Employee
You will find no records
Insert Statements
INSERT INTO Employee (FNAME,LNAME,ADDRESS,CREATEDDATE) VALUES('DILIP','SINGH','DELHI',GETDATE())
INSERT INTO Employee (FNAME,LNAME,ADDRESS,CREATEDDATE) VALUES('VIPUL','BHATT','NOIDA',GETDATE())
INSERT INTO Employee (FNAME,LNAME,ADDRESS,CREATEDDATE) VALUES('RAJ','SINGH','BOKARO',GETDATE())
Again run select statement.
SELECT * FROM Employee
Result
DELETE
Delete statement use to delete records from the table.
Syntax:
DELETE FROM <table name> WHERE <condition>
Example:
IF OBJECT_ID('dbo.Employee', 'U') IS NOT NULL
       DROP TABLE Employee
CREATE TABLE Employee
(
       ID INT IDENTITY(1,1),
       FNAME VARCHAR(50),
       LNAME VARCHAR(50),
       ADDRESS VARCHAR(1000),
       CREATEDDATE DATETIME
)
INSERT INTO Employee (FNAME,LNAME,ADDRESS,CREATEDDATE) VALUES('DILIP','SINGH','DELHI',GETDATE())
INSERT INTO Employee (FNAME,LNAME,ADDRESS,CREATEDDATE) VALUES('VIPUL','BHATT','NOIDA',GETDATE())
INSERT INTO Employee (FNAME,LNAME,ADDRESS,CREATEDDATE) VALUES('RAJ','SINGH','BOKARO',GETDATE())
Run above query then select statement

SELECT * FROM Employee
 Result
Delete Statement
DELETE FROM Employee
Note: this query will delete all records of the table

Delete records with condition, where clause use for the condition
DELETE FROM Employee WHERE FNAME='DILIP'
Now run the select statement
SELECT * FROM Employee
Result
Above result set show, the row which FNAME is DILIP has been deleted from the table.

UPDATE
Update statement use to update particular column record in table.
Syntax:
UPDATE <table name> SET <column name> WHERE <condition>
Example:
IF OBJECT_ID('dbo.Employee', 'U') IS NOT NULL
       DROP TABLE Employee
CREATE TABLE Employee
(
       ID INT IDENTITY(1,1),
       FNAME VARCHAR(50),
       LNAME VARCHAR(50),
       ADDRESS VARCHAR(1000),
       CREATEDDATE DATETIME
)
INSERT INTO Employee (FNAME,LNAME,ADDRESS,CREATEDDATE)
 VALUES('DILIP','SINGH','DELHI',GETDATE())
INSERT INTO Employee (FNAME,LNAME,ADDRESS,CREATEDDATE) VALUES('VIPUL','BHATT','NOIDA',GETDATE())
INSERT INTO Employee (FNAME,LNAME,ADDRESS,CREATEDDATE) VALUES('RAJ','SINGH','BOKARO',GETDATE())
Run above query then select statement 

Result:

Update Statement
UPDATE Employee SET ADDRESS='GORAKHPUR' 
It will update the ADDRESS column with 'GORAKHPUR' of all table row.
Run select statement
SELECT * FROM Employee
Result
Update Statement with  condition
UPDATE Employee SET ADDRESS='GORAKHPUR' WHERE FNAME='DILIP'
run select statement
SELECT * FROM Employee
Result:

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