Primary key sql

Sql primary key

/* A primary key allows each record in a table to be uniquely identified. There can only be one
primary key per table, and you can assign this constraint to any single or combination of columns.
However, this means each value within this column(s) must be unique.
Typically in a table, the primary key is an ID column, and is usually paired with the AUTO_
INCREMENT keyword. This means the value increases automatically as new records are created. */
CREATE TABLE stats(id INT NOT NULL PRIMARY KEY, name TEXT)

Primary key sql

CREATE TABLE student

(

Roll integer (15) NOT NULL PRIMARY KEY,

Name varchar (255),

Class varchar (255),

Contact No varchar (255),

);

Source: wlearnsmart.com

Primary key in sql

منحصر به فرد بودن هر رکورد

Primary key in sql

Primary Key :
It is unique column in every table in a database
It can ONLY accept;
    - nonduplicate values
    - cannot be NULL

Similar codes

0 vote193 views1 answer
Search mysql database for column
SQL
4 votes186 views2 answers
How to delete row in sql
SQL
0 vote196 views1 answer
Mysql order by rand limit 1 really slow
SQL
4 votes204 views3 answers
Mysql modify foreign key
SQL
0 vote174 views1 answer
Get who is hired in month in sql
SQL
5 votes190 views1 answer
Ignore duplicate rows in sqlite
SQL
0 vote212 views1 answer
The fetch keyword oracle
SQL
0 vote225 views1 answer
Sql grant select only
SQL
0 vote210 views1 answer
Drop index in sql
SQL
0 vote230 views1 answer
Connect to nginx server mysql remotly
SQL