sqlite unique primary key
UNIQUE Constraint − Ensures that all values in a column are different. PRIMARY Key − Uniquely identifies each row/record in a database table. CHECK ... ,The primary key of the table: is a column or a group of columns that uniquely ... The email and phone are unique therefore you use the UNIQUE constraint for ...
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 sqlite unique primary key 相關參考資料
Primary key or Unique index? - Stack Overflow
A primary key also implies NOT NULL, but a unique index can be nullable. There can be only one primary key, but there can be multiple unique indexes. If there ... https://stackoverflow.com SQLite Constraints - Tutorialspoint
UNIQUE Constraint − Ensures that all values in a column are different. PRIMARY Key − Uniquely identifies each row/record in a database table. CHECK ... https://www.tutorialspoint.com SQLite Create Table with Examples - SQLite Tutorial
The primary key of the table: is a column or a group of columns that uniquely ... The email and phone are unique therefore you use the UNIQUE constraint for ... http://www.sqlitetutorial.net SQLite PRIMARY KEY - TutorialsPoint
https://www.tutorialspoint.com Sqlite primary key on multiple columns - Stack Overflow
sqlite> CREATE TABLE something ( column1, column2, value, PRIMARY KEY .... In another way, you can also make the two column primary key unique and the ... https://stackoverflow.com SQLite Primary Key: The Ultimate Guide To Primary Key - SQLite Tutorial
This tutorial shows you how to use SQLite PRIMARY KEY constraint to define the primary key for a table. http://www.sqlitetutorial.net SQLite Query Language: CREATE TABLE
Both single column and composite (multiple column) primary keys are supported. A set of SQL constraints for each table. SQLite supports UNIQUE, NOT NULL, ... https://www.sqlite.org SQLite UNIQUE Constraint - SQLite Tutorial
In this tutorial, you will learn how to use the SQLite UNIQUE constraint to ensure all values in a column or a group of ... contact_id INTEGER PRIMARY KEY,. http://www.sqlitetutorial.net SQLite 约束| 菜鸟教程
SQLite 约束约束是在表的数据列上强制执行的规则。 ... UNIQUE 约束：确保某列中的所有值是不同的。 ... PRIMARY Key 约束：唯一标识数据库表中的各行/记录。 http://www.runoob.com SQLite: Unique Constraints - TechOnTheNet
This SQLite tutorial explains how to create, add, and drop unique constraints in SQLite ... What is the difference between a unique constraint and a primary key? https://www.techonthenet.com |