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 FNAME, LNAME, ADDRESS 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
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())
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.
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:
