what is primary key,unique key, foreign key? can u teach me
in simple language?
Answers were Sorted based on User's Feedback
Answer / pounammal sambath
primary key:
* primary key is the key which is used to for unique identification of the row in the table.
*it does not allows the duplicate and null values.
| Is This Answer Correct ? | 0 Yes | 1 No |
Answer / patel gopikumar
PRIMARY KEY : it is a key that not allow null value in database tables field....
UNIQUE KEY : it is a key that store or manage data uniquely...
FOREIGN KEY : it is key that use is...connect two fields in the different tables........with foreign key......
thnks........
s-150907-007 PATEL GOPIKUMAR
| Is This Answer Correct ? | 5 Yes | 12 No |
Answer / sri lekha
a key to open primary school is primary key
a key for foreign schools is foreign key
answering this way is unique
| Is This Answer Correct ? | 16 Yes | 44 No |
Answer / manmohan singh
The key to Prime Ministers office in delhi is known as
primary key. The key to Foreign Secy's cabin is foreign key.
| Is This Answer Correct ? | 114 Yes | 263 No |
What is ole db used for?
List the properties of a transaction.
What is sharded database?
What is aws documentdb?
Can we use redis as database?
What is OQL?
What is a database lookup?
What is the difference between data source and database?
What do you mean by cluster and non cluster index?
Which is the most reliable programming language for RDBMS Relational Database Management System for Multi user applicaton. For PC application or web application ?
What is a database call?
What are the advantages of normalizing a database.
Oracle (3253)
SQL Server (4518)
MS Access (429)
MySQL (1402)
Postgre (483)
Sybase (267)
DB Architecture (141)
DB Administration (291)
DB Development (113)
SQL PLSQL (3330)
MongoDB (502)
IBM Informix (50)
Neo4j (82)
InfluxDB (0)
Apache CouchDB (44)
Firebird (5)
Database Management (1411)
Databases AllOther (288)