Primary key in 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

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

Primary key in sql

منحصر به فرد بودن هر رکورد

Similar codes

0 vote313 views1 answer
Database get 10 user aleatory
SQL
9 votes315 views1 answer
Sql server get utc date
SQL
0 vote388 views1 answer
Sqlite schema structure of a relational database
SQL
2 votes326 views1 answer
Mysql ALTER TABLE ADD COLUMN BOOLEAN AFTER DEFAULT "1";
SQL
1 vote361 views1 answer
Oracle plan hash value
SQL
0 vote290 views7 answers
10 random questions use python and SQL
SQL
0 vote335 views1 answer
Mssql dockere
SQL
0 vote297 views2 answers
Mysql slave status
SQL
0 vote297 views1 answer
Raiserror nowait sql server
SQL
0 vote327 views1 answer
List all indexes postgres
SQL