Home
SQL / MySQL
Aggregate Functions
Backup Load
Command MySQL
Cursor
Data Type
Database
Date Time
Engine
Event
Flow Control
FullText Search
Function
Geometric
I18N
Insert Delete Update
Join
Key
Math
Procedure Function
Regular Expression
Select Clause
String
Table Index
Transaction
Trigger
User Permission
View
Where Clause
XML
Primary Key « Key « SQL / MySQL
SQL / MySQL
Key
Primary Key
1.
Setting a Primary Key 1
2.
Setting a Primary Key 2
3.
Setting a Primary Key 3
4.
Define and use primary key
5.
Alter table to Add an PRIMARY KEY
6.
Another way to enforce uniqueness is to add a UNIQUE index rather than a PRIMARY KEY to a table.
7.
To drop an index that is not a PRIMARY KEY, you must specify the index name.
8.
Adding primary key for not null column
9.
Defining Primary Keys
10.
Use a PRIMARY KEY constraint
11.
If you were creating a primary key on more than one column, you would include both of those column names in th
12.
Two ways to declare primary key when creating the table
13.
Create a table t that contains an id column that's NOT NULL and declared as a primary key by means of a PRIMAR
14.
A primary key on a column can be created by replacing PRIMARY KEY with UNIQUE in the table definition, provide
15.
Add PRIMARY KEY or UNIQUE directly to the end of the column definition.
16.
Create a primary key on the last_name and first_name columns using a PRIMARY KEY clause
17.
Create a multiple-column primary key using UNIQUE, if the columns are declared NOT NULL
18.
Using three column as the primary key
19.
Drop primary key