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SQL UPDATE buyrug‘i

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SQL UPDATE buyrug‘i

UPDATE buyrug‘i jadvaldagi bir yoki bir nechta yozuvni yangilash (UPDATE) yoki o‘zgartirish uchun ishlatiladi.

UPDATE sintaksisi

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

Eslatma: Jadvaldagi yozuvlarni yangilashda juda ehtiyot bo‘ling! UPDATE buyrug‘idagi WHERE shartiga e’tibor bering. WHERE sharti aynan qaysi yozuv(lar) yangilanishini belgilaydi. Agar WHERE shartini qoldirib ketsangiz, jadvaldagi BARCHA yozuvlar yangilanib ketadi!

Demo ma’lumotlar bazasi

Quyida misollarda foydalanilgan Customers jadvalidan tanlanma keltirilgan:

CustomerID CustomerName ContactName Address City PostalCode Country
1

 Alfreds Futterkiste Maria Anders Obere Str. 57 Berlin 12209 Germany
2 Ana Trujillo Emparedados y helados Ana Trujillo Avda. de la Constitución 2222 México D.F. 05021 Mexico
3 Antonio Moreno Taquería Antonio Moreno Mataderos 2312 México D.F. 05023 Mexico
4

 Around the Horn Thomas Hardy 120 Hanover Sq. London WA1 1DP UK
5 Berglunds snabbköp Christina Berglund Berguvsvägen 8 Luleå S-958 22 Sweden

Jadvalni yangilash

Quyidagi SQL rekordni CustomerID = 1, yangi aloqa shaxsi VA yangi City bilan yangilaydi.

Misol

UPDATE Customers
SET ContactName = 'Alfred Schmidt', City= 'Frankfurt'
WHERE CustomerID = 1;

"Customers" jadvalidan tanlanma endi quyidagicha ko‘rinadi:

CustomerID CustomerName ContactName Address City PostalCode Country
1

 Alfreds Futterkiste Alfred Schmidt Obere Str. 57 Frankfurt 12209 Germany
2 Ana Trujillo Emparedados y helados Ana Trujillo Avda. de la Constitución 2222 México D.F. 05021 Mexico
3 Antonio Moreno Taquería Antonio Moreno Mataderos 2312 México D.F. 05023 Mexico
4

 Around the Horn Thomas Hardy 120 Hanover Sq. London WA1 1DP UK
5 Berglunds snabbköp Christina Berglund Berguvsvägen 8 Luleå S-958 22 Sweden

Bir nechta yozuvni yangilash

WHERE bandi qaysi yozuvlar yangilanishini belgilaydi.

Quyidagi SQL Country qiymati "Mexico" bo‘lgan BARCHA yozuvlar uchun ContactName qiymatini "Juan" ga o‘zgartiradi:

Misol

UPDATE Customers
SET ContactName='Juan'
WHERE Country='Mexico';

"Customers" jadvalidan tanlanma endi quyidagicha ko‘rinadi:

CustomerID CustomerName ContactName Address City PostalCode Country
1

 Alfreds Futterkiste Alfred Schmidt Obere Str. 57 Frankfurt 12209 Germany
2 Ana Trujillo Emparedados y helados Juan Avda. de la Constitución 2222 México D.F. 05021 Mexico
3 Antonio Moreno Taquería Juan Mataderos 2312 México D.F. 05023 Mexico
4

 Around the Horn Thomas Hardy 120 Hanover Sq. London WA1 1DP UK
5 Berglunds snabbköp Christina Berglund Berguvsvägen 8 Luleå S-958 22 Sweden

UPDATE bo‘yicha muhim ogohlantirish!

Yozuvlarni yangilashda ehtiyot bo‘ling. Agar WHERE bandini tushirib qoldirsangiz, BARCHA yozuvlar yangilanadi!

Quyidagi SQL BARCHA yozuvlar uchun ContactName qiymatini "Juan" ga o‘zgartiradi:

Misol

UPDATE Customers
SET ContactName='Juan';

"Customers" jadvalidan tanlanma endi quyidagicha ko‘rinadi:

CustomerID CustomerName ContactName Address City PostalCode Country
1

 Alfreds Futterkiste Juan Obere Str. 57 Frankfurt 12209 Germany
2 Ana Trujillo Emparedados y helados Juan Avda. de la Constitución 2222 México D.F. 05021 Mexico
3 Antonio Moreno Taquería Juan Mataderos 2312 México D.F. 05023 Mexico
4

 Around the Horn Juan 120 Hanover Sq. London WA1 1DP UK
5 Berglunds snabbköp Juan Berguvsvägen 8 Luleå S-958 22 Sweden

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