2. Agenda
Morning Session Afternoon Session
- Normalization คืออะไร มี
อะไรบาง
- Workshop design
database
- Import data
- SQL101
- Trigger
- Stored Procedure
- User Defined Function
- Workshop query report
- Conclusion
3. Normalization
1NF - Eliminate Repeating Groups (Make a separate table for each
set of related attributes, and give each table a primary key)
2NF - A relation is in second normal form if it is in 1NF and
every non key attribute is fully functionally dependent on the
primary key.
3NF - A relation is in second normal form if it is in 2NF and
Every non-prime attribute of R is non-transitively dependent
on every key of R (Relation Table)
8. Import data
- Setup extension from https://bit.ly/2CoUtgT
- Convert excel or any sources to CSV
- Import CSV by extension into database
9. Structure Query Language
[SELECT] - [FROM] - [WHERE] - [GROUP BY] - [HAVING] - [ORDER BY]
- SELECT FirstName, LastName FROM Employee
- SELECT * FROM Employee
- SELECT FirstName FROM Employee ORDER BY FirstName
- SELECT FirstName FROM Employee WHERE Department=’HR’
- SELECT FIrstName
FROM Employee
WHERE Department=’HR’
ORDER BY FirstName
10. JOIN Operator
SELECT FirstName, DepartmentName
FROM Employee
INNER JOIN Department ON EmployeeId.DepId = Department.DepId
SELECT FirstName, DepartmentName
FROM Employee
INNER JOIN Department ON EmployeeId.DepId = Department.DepId
INNER JOIN ControlManager ON ControlManager.MgrId =
Employee.MgrId
16. LEFT JOIN SQL:
SELECT รหัสพนักงาน, ชื่อพนักงาน, วันที่ลางาน
FROM ขอมูลพนักงาน as emp
LEFT JOIN ขอมูลการลางาน as leave
ON emp.รหัสพนักงาน = leave.รหัสพนักงาน
17. Query Processor
1. FROM
2. ON
3. JOIN
4. WHERE
5. GROUP BY
6. WITH CUBE or WITH
ROLLUP
7. HAVING
8. SELECT
9. DISTINCT
10. ORDER BY
11. TOP
18. Aggregation
1. COUNT - นับจํานวนแถวทั้งหมด (records)
2. MIN - หาคาที่ตํ่าที่สุด (minimize)
3. MAX - หาคามากที่สุด (maximize)
4. SUM - หาผลรวม (summation)
5. AVG - หาคาเฉลี่ย (average)