SQL PRIMARY KEY Constraint - W3Schools Online Web Tutorials To allow naming of a PRIMARY KEY constraint, and for defining a PRIMARY KEY constraint on multiple columns, use the following SQL syntax: ... CREATE TABLE Persons (P_Id int NOT NULL, LastName varchar(255) NOT NULL, FirstName varchar(255),
SQL PRIMARY KEY 約束 - w3school 在線教程 SQL PRIMARY KEY Constraint on CREATE TABLE 下麵的 SQL 在 "Persons" 表創建時在 "Id_P" 列創建 PRIMARY KEY 約束： MySQL: CREATE TABLE Persons ( Id_P int NOT NULL, LastName varchar(255) NOT NULL, FirstName varchar(255), Address varchar(255 ...
How to create a table with a non clustered primary key in SQL Server 2000 2005 and 2008 - SQL Server Unless otherwise specified when you create your tables primary key in SQL Server 2000, 2005 and 2008 will have a clustered index on it. This will be a good default choice if you are going to be joining other tables together on this value. If you are going
Creating Table with combined primary key : Create Table « Table « Oracle PL / SQL Creating Table with combined primary key : Create Table « Table « Oracle PL / SQL ... SQL> create table employee_history 2 (employee_id number(6) not null, 3 salary number(8,2), 4 hire_date date default sysdate, 5 termination_date ...
Using a CREATE TABLE statement: create a table with primary key : Create Table « Table « Oracle PL / Using a CREATE TABLE statement: create a table with primary key : Create Table « Table « Oracle PL / SQL ... SQL> SQL> --Using a CREATE TABLE statement SQL> SQL> CREATE TABLE supplier 2 ( supplier_id numeric(10) not null, 3 supplier ...
建立主索引鍵 - MSDN - Microsoft 發行前資訊會描述Microsoft SQL Server 2014 中的新功能或現有功能的變更。 ... PRIMARY KEY 條件約束內所定義的所有資料行，都必須定義成NOT NULL。 ... 建立具有主索引鍵的新資料表，需要資料庫中的CREATE TABLE 權限及建立資料表的 ...
PRIMARY KEY Constraints - TechNet - Microsoft This column, or columns, is called the primary key (PK) of the table and enforces the entity integrity of the table. ... SQL Server 2008 R2 ... You can create a primary key by defining a PRIMARY KEY constraint when you create or modify a table.
SQL: CREATE TABLE Statement - TechOnTheNet.com Now the only problem with this SQL CREATE TABLE statement is that you have not defined a primary key for the table. We could modify this SQL CREATE ...
SQL Server Add Primary Key - SQL Server Planet 2010年2月12日 - Adding a primary key can be done either after a table is created, or at the same a table is created. It is important to note, that by default a ...
MS SQL Server Alter Table Add Primary Key - RazorSQL The RazorSQL alter table tool includes an Add Primary Key option for adding foreign keys to MS SQL Server database tables. The add primary key function lists ...
