AVG Function

SQL AVG() Funktsiyasi

AVG() funktsiyasi raqamli ustunning o'rtacha qiymatini qaytaradi.

SELECT AVG(column_name)
FROM table_name
WHERE condition;

Umumiy O'rtacha Narxni Topish Barcha mahsulotlarning narxining o'rtacha qiymatini topish:

SELECT AVG(Price) AS [Average Price]
FROM Products;

Quyidagi jadval misol sifatida Products jadvalidan olingan:

ProductID	ProductName	SupplierID	CategoryID	Unit	Price
1	Chais	1	1	10 boxes x 20 bags	18
2	Chang	1	1	24 - 12 oz bottles	19
3	Aniseed Syrup	1	2	12 - 550 ml bottles	10
4	Chef Anton's Cajun Seasoning	2	2	48 - 6 oz jars	22
5	Chef Anton's Gumbo Mix	2	2	36 boxes	21.35

Shartlarni belgilash uchun WHERE klauzasini qo'shishingiz mumkin.

Misol: Kategoriya 1 bo'lgan mahsulotlarning narxining o'rtacha qiymatini qaytarish:

SELECT AVG(Price) AS [Average Price in Category 1]
FROM Products
WHERE CategoryID = 1;

O'rtacha qiymatni ko'rsatish uchun ustunga nom berish uchun AS kalit so'zidan foydalaning.

Misol: "o'rtacha narx" nomini berish:

SELECT AVG(Price) AS [Average Price]
FROM Products;

O'rtacha narxdan yuqori bo'lgan barcha yozuvlarni ro'yxatga olish uchun, AVG() funktsiyasini sub-queryda ishlatishimiz mumkin.

Misol: O'rtacha narxdan yuqori bo'lgan barcha mahsulotlarni qaytarish:

SELECT *
FROM Products
WHERE Price > (SELECT AVG(Price) FROM Products);

AVG() funktsiyasini va GROUP BY klauzasini birgalikda ishlatish orqali har bir kategoriya uchun o'rtacha narxni qaytarish mumkin.

Misol: Har bir CategoryID uchun o'rtacha narxni hisoblash:

SELECT AVG(Price) AS AveragePrice, CategoryID
FROM Products
GROUP BY CategoryID;