I have the following table: create table stuff ( id mediumint unsigned not null auto_increment primary key,
i have this code here drop table if exists Payments; create table Payments ( customer_email VARCHAR(50) NOT NULL,
Can anyone tell me what is the difference 开发者_运维百科between a primary key and index key. And when to use which?A primary key is a special kind of index in that:
I have table broker wi开发者_运维技巧th this form broker { broker_code char(10) primary key . . . } and i have add to it another primary key with this form
I have a legacy DB with join tables that have I开发者_开发问答Ds as primary keys... Is there anything I can do?
I am using Ruby on Rails 3 and I would like to change the default primary key for a SQL database table from id to account_id. The account_id statement and behavior should be the same of id (auto-incre
I have a situation where stock quantity can be updated both from administrator and supplier, each containing two different keys adminID and supplierID.
I need to copy dt2 into dt1 but I can\'t use dt1 = dt2 because dt1 has a primary key while d开发者_如何学Pythont2 does not. What\'s the best way to do this?
I am building a web application using a distrbuted NoSQL DB. However, for generating Ids for the new e开发者_开发问答ntities, I am using MySQL as Flickr\'s ticket server
The project that I\'m working has dirty data in the database.Basically, the original designer created foreign key fields but didn\'t enforce them with referential integrity.Now there are FK values tha
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