Mustaqil ishi re’ja m

ALTER TABLE ADD ;

DROP - jadvalni o’chirish buyrug’i. Jadvalni o'chirish imkoniga ega bo’lish uchun, jadval egasi (ya’ni yaratuvchisi) bo’lshingiz kerak. Faqat bo‘sh jadvalni o'chirish mumkin. Qatorlarga ega bo’lgan, to’ldirilgan jadvalni o‘chirish mumkin emas, ya’ni jadval o‘chirishdan oldin tozalangan bo’lshi kerak. Jadvalni o'chirish buyrug'i quyidagi ko‘rinishga ega:

DROP TABLE ;

Ishni bajarish tartibi

1.Avval dastur ko’dlarini MYSQLda yozib olamiz va jadval xosil qilamiz.

Сreate database talabalara;

use talabalara;
create table Persons(

PersonID int,

Lastname varchar(255),

Firstname varchar(255),

Address varchar(255),

city varchar(255)

);

2.select*from kodi orqali talabalar malumotlarini kiritamiz.

select *from persons;

insert into Persons (PersonID,Lastname,Firstname,Address,city)

values(123456,'Tursunboy','Rasulov','Andijon 17','Boston');

insert into Persons(PersonID,Lastname,Firstname,Address, city)

values(234567,'Dilshod','Xudoyqulov','Surxondaryo','Termiz');

insert into Persons(PersonID,Lastname, Firstname,Address,city)

values(345612,'Alisher','Majidov','Surxondaryo','Boysun');

insert into Persons(PersonID,Lastname,Firstname,Address,city)

values(456123,'Nizomiddin','Muxtorov','Samarqand','Jomboy');

insert into Persons(PersonID,Lastname,Firstname,Address,city)

values(213456,'Nurshod','SHarofiddinov','Buxoro','Buhoro');

insert into Persons(PersonID,Lastname,Firstname,Address,city)

values(322212,'Muzrob','Sevarov','Qashqadaryo','Qarshi');

insert into Persons(PersonID,Lastname,Firstname,Address,city)

values(4343433,'Shuhrat','Rajabov','Qashqadaryo','Yakkabog');

3..Endi biz talabalar jadvaliga ‘DateOfBirth’nomli ustun qo’shamiz,

Quyidagi SQL bayonotida foydalanamiz;

ALTER TABLE Persons

ADD DateOfBirth date;

4. talabalar royxatidan talabalarni o’chirish.

Quyidagi SQL bayonotida foydalanamiz;

Delete from Persons where Lastname=’Tursunboy’;

DROP komandasi orqali ham o’chirish mumkin,lekin bizga unga ehtiyoj bo’lmagani uchun undan foydalanmaymiz.