what is primary key

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Claudio
02 Aug 2020
1CREATE TABLE `Donor`(
2  `did` int(50) NOT NULL,
3  `oid` int(50) NOT NULL,
4  `dname` varchar(50) NOT NULL,
5  `dblood` varchar(50) NOT NULL,
6  PRIMARY KEY (`did`, `oid`)
7);
source
Mariana
08 Jan 2019
1Primary Key :
2It is unique column in every table in a database
3It can ONLY accept;
4    - nonduplicate values
5    - cannot be NULL
6
7
8
9Foreign Key: 
10It is a column that comes from a different table and
11using Foreign key tables are related each other
12It is the primary key of another table
13It can be duplicate or null for another table
14
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16
17
18Unique Key:
19Only unique value and also can contain NULL
Edoardo
28 Jan 2021
1PRIMARY KEY
2   -- unique identifier for the entire row of record in a table
3   --  can not be null and must be unique
Anas
18 Jun 2016
1PRIMARY KEY  -- unique identifier for the entire row of record in a table 
2             -- can not be null and must be unique
Colby
06 Jan 2018
1CREATE TABLE Persons (
2    Rollno int NOT NULL,
3    FirstName varchar(255),
4    LastName varchar(255),
5    Age int,
6    PRIMARY KEY (ID)
7);
8
Erika
25 Aug 2016
1Primary Key :
2It is unique column in every table in a database
3It can ONLY accept;
4    - nonduplicate values
5    - cannot be NULL
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