Tech – Different ways to maintain state in ASP.Net

Different ways through which we can maintain state in Asp.Net are:

1. Hidden Fields

2. View State

3. Hidden Frames

4. Cookies

5. Query Strings

Quick References for Writing SQL Queries

KEYWORD: SELECT\FROM\WHERE\AND\OR

SELECT column_name(s) FROM table_name
WHERE condition AND|OR condition

KEYWORD: ALTER\ADD\DROP\COLUMN

ALTER TABLE table_name 
ADD column_name datatype

ALTER TABLE table_name 
DROP COLUMN column_name

KEYWORD: AS

SELECT column_name AS column_alias
FROM table_name

SELECT column_name
FROM table_name  AS table_alias

KEYWORD: BETWEEN\AND

SELECT column_name(s)
FROM table_name
WHERE column_name
BETWEEN value1 AND value2

KEYWORD: CREATE\DATABASE

CREATE DATABASE database_name

KEYWORD: TABLE

CREATE TABLE table_name
(
column_name1 data_type,
column_name2 data_type,
column_name2 data_type,
…)

KEYWORD: INDEX\UNIQUE INDEX

CREATE INDEX index_name
ON table_name (column_name)

CREATE UNIQUE INDEX index_name
ON table_name (column_name)

KEYWORD: VIEW

CREATE VIEW view_name AS
SELECT column_name(s)
FROM table_name
WHERE condition

KEYWORD: DELETE

DELETE FROM table_name
WHERE some_column=some_value

DELETE FROM table_name (Deletes the entire table)

DELETE * FROM table_name (Deletes the entire table)

KEYWORD: DROP

DROP DATABASE database_name

KEYWORD: INDEX

DROP INDEX table_name.index_name

KEYWORD: DROP\TABLE

DROP TABLE table_name

KEYWORD: EXISTS

IF EXISTS (SELECT * FROM table_name WHERE id = ?)
BEGIN
–do what needs to be done if exists
END
ELSE
BEGIN
–do what needs to be done if not
END

KEYWORD: GROUP BY

SELECT column_name, aggregate_function(column_name)
FROM table_name
WHERE column_name operator value
GROUP BY column_name

KEYWORD: HAVING

SELECT column_name, aggregate_function(column_name)
FROM table_name
WHERE column_name operator value
GROUP BY column_name
HAVING aggregate_function(column_name) operator value

KEYWORD: IN

SELECT column_name(s)
FROM table_name
WHERE column_name
IN (value1,value2,..)

KEYWORD: INSERT INTO

INSERT INTO table_name
VALUES (value1, value2, value3,….)

INSERT INTO table_name
(column1, column2, column3,…)
VALUES (value1, value2, value3,….)

KEYWORD: INNER JOIN\ON

SELECT column_name(s)
FROM table_name1
INNER JOIN table_name2 
ON table_name1.column_name=table_name2.column_name

KEYWORD: LEFT JOIN

SELECT column_name(s)
FROM table_name1
LEFT JOIN table_name2 
ON table_name1.column_name=table_name2.column_name

KEYWORD: RIGHT JOIN

SELECT column_name(s)
FROM table_name1
RIGHT JOIN table_name2 
ON table_name1.column_name=table_name2.column_name

KEYWORD: FULL JOIN

SELECT column_name(s)
FROM table_name1
FULL JOIN table_name2 
ON table_name1.column_name=table_name2.column_name

KEYWORD: LIKE

SELECT column_name(s)
FROM table_name
WHERE column_name LIKE pattern

KEYWORD: ORDER BY\ASC\DESC

SELECT column_name(s)
FROM table_name
ORDER BY column_name [ASC|DESC]

KEYWORD: SELECT

SELECT column_name(s)
FROM table_name

KEYWORD: SELECT\DISTINCT

SELECT DISTINCT column_name(s)
FROM table_name

KEYWORD: SELECT\INTO

SELECT *
INTO new_table_name [IN externaldatabase]
FROM old_table_name

SELECT column_name(s)
INTO new_table_name [IN externaldatabase]
FROM old_table_name

KEYWORD: TOP

SELECT TOP number|percent column_name(s)
FROM table_name

KEYWORD: TRUNCATE

TRUNCATE TABLE table_name

KEYWORD: UNION

SELECT column_name(s) FROM table_name1
UNION
SELECT column_name(s) FROM table_name2

KEYWORD: UNION ALL

SELECT column_name(s) FROM table_name1
UNION ALL
SELECT column_name(s) FROM table_name2

KEYWORD: UPDATE\SET

UPDATE table_name
SET column1=value, column2=value,…
WHERE some_column=some_value

KEYWORD: WHERE

SELECT column_name(s)
FROM table_name
WHERE column_name operator value

Reference:

http://www.w3schools.com/sql/sql_quickref.asp