Database Management - Lecture 2 - SQL select, insert, update and delete

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The document outlines key aspects of SQL, highlighting its importance in web development. It details fundamental SQL commands such as SELECT, UPDATE, DELETE, and INSERT, along with usage examples and operators for data retrieval and manipulation. The document also explains how to create and modify databases and tables.

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Why SQL
Execute queries against a database
Retrieve data from a database
Insert records in a database
Update records in a database
Delete records from a database
Create new databases
Create new tables in a database
Create views in a database

Important SQL Commands
 SELECT - extracts data from a database
 UPDATE - updates data in a database
 DELETE - deletes data from a database
 INSERT INTO - inserts new data into a database
 CREATE DATABASE - creates a new database
 ALTER DATABASE - modifies a database
 CREATE TABLE - creates a new table
 ALTER TABLE - modifies a table
 DROP TABLE - deletes a table
 CREATE INDEX - creates an index (search key)
 DROP INDEX - deletes an index

Select
SELECT * FROM table_name;
SELECT column1, column2, ...
FROM table_name;

SELECT DISTINCT
SELECT DISTINCT column_name FROM
table_name;

WHERE Clause
SELECT column1, column2, ...
FROM table_name
WHERE condition;
Example:
SELECT * FROM students
WHERE age='15';

Operators
 = Equal
 <> Not equal. Note: ( != )
 > Greater than
 < Less than
 >= Greater than or equal
 <= Less than or equal
 BETWEEN Between an inclusive range
 LIKE Search for a pattern
 IN To specify multiple possible values for a column

AND, OR and NOT
AND
SELECT * FROM table_name
WHERE condition1 AND condition2 AND condition3;
OR
SELECT * FROM table_name
WHERE condition1 OR condition2 OR condition3 ;
NOT
SELECT * FROM table_name
WHERE NOT condition;

ORDER BY
SELECT column1, column2, ...
FROM table_name
ORDER BY column ASC/DESC;
Example:
SELECT * FROM students ORDER BY id;
SELECT * FROM students ORDER BY id ASC;
SELECT * FROM students ORDER BY id DESC;

NULL
SELECT column_names
FROM table_name
WHERE column_name IS NULL;
SELECT column_names
FROM table_name
WHERE column_name IS NOT NULL;

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

UPDATE
UPDATE table_name
SET column1 = value1, column2 = value2, ...
WHERE condition;

DELETE
DELETE FROM table_name
WHERE condition;
DELETE FROM table_name;
DELETE * FROM table_name;

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Database Management - Lecture 2 - SQL select, insert, update and delete

1. WEB DEVELOPMENT

2. PHP PRESENTATORS MD. AL-MAMUN SARKAR

3. SQL

4. Structured Query Language

5. Why SQL Execute queries against a database Retrieve data from a database Insert records in a database Update records in a database Delete records from a database Create new databases Create new tables in a database Create views in a database

6. Important SQL Commands  SELECT - extracts data from a database  UPDATE - updates data in a database  DELETE - deletes data from a database  INSERT INTO - inserts new data into a database  CREATE DATABASE - creates a new database  ALTER DATABASE - modifies a database  CREATE TABLE - creates a new table  ALTER TABLE - modifies a table  DROP TABLE - deletes a table  CREATE INDEX - creates an index (search key)  DROP INDEX - deletes an index

7. Select SELECT * FROM table_name; SELECT column1, column2, ... FROM table_name;

8. SELECT DISTINCT SELECT DISTINCT column_name FROM table_name;

9. WHERE Clause SELECT column1, column2, ... FROM table_name WHERE condition; Example: SELECT * FROM students WHERE age='15';

10. Operators  = Equal  <> Not equal. Note: ( != )  > Greater than  < Less than  >= Greater than or equal  <= Less than or equal  BETWEEN Between an inclusive range  LIKE Search for a pattern  IN To specify multiple possible values for a column

11. AND, OR and NOT AND SELECT * FROM table_name WHERE condition1 AND condition2 AND condition3; OR SELECT * FROM table_name WHERE condition1 OR condition2 OR condition3 ; NOT SELECT * FROM table_name WHERE NOT condition;

12. ORDER BY SELECT column1, column2, ... FROM table_name ORDER BY column ASC/DESC; Example: SELECT * FROM students ORDER BY id; SELECT * FROM students ORDER BY id ASC; SELECT * FROM students ORDER BY id DESC;

13. NULL SELECT column_names FROM table_name WHERE column_name IS NULL; SELECT column_names FROM table_name WHERE column_name IS NOT NULL;

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

15. UPDATE UPDATE table_name SET column1 = value1, column2 = value2, ... WHERE condition;

16. DELETE DELETE FROM table_name WHERE condition; DELETE FROM table_name; DELETE * FROM table_name;

17. QUESTION ?

18. THANK YOU

Database Management - Lecture 2 - SQL select, insert, update and delete

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