Assume,there are three tables in a database, Can i have
both primary key and foreign key for each table in the same
database?
Answers were Sorted based on User's Feedback
Answer / madhu
We can create 3 tables with PK and FK but can not insert
rows. Try it.
| Is This Answer Correct ? | 5 Yes | 0 No |
Answer / siva
Hi,
You can place the foreign key column in each table to allow
nulls. And insert values.
But I am still worried a lot about deletion of the values
from these tables ?
Plz post your comments
Regards,
Subbu
| Is This Answer Correct ? | 0 Yes | 0 No |
Answer / subbu
Yes we can have that ! Let me expalin with this small
example.
(PK)ProjectID (FK)ClientID -- Project Table
(PK)ClientID (FK)ProjectManagerID -- ClientTable
(PK)Employee (FK)ProjetcID -- Employee Table
Check This In this example I am having 3 tables and each
table have PK and FK.
| Is This Answer Correct ? | 1 Yes | 5 No |
Why does sql studio use a single registered database repository? : sql server management studio
How to declare a cursor with "declare ... Cursor" in ms sql server?
What is hierarchy, what are its types and difference between them? : sql server analysis services, ssas
How use inner join in sql server?
Which are the important points to note when multilanguage data is stored in a table?
What extended events?
What gets stored inside msdb database?
What is log shipping? Can we do logshipping with SQL Server 7.0 - Logshipping is a new feature of SQL Server 2000. We should have two SQL Server - Enterprise Editions. From Enterprise Manager we can configure the logshipping. In logshipping the transactional log file from one server is automatically updated into the backup database on the other server. If one server fails, the other server will have the same db and we can use this as the DR (disaster recovery) plan.
How do you identify a foreign key?
What are acid properties of transaction?
What will be query used to get the list of triggers in a database?
table:employee EID ENAME MID(manager ids) 101 rama null 102 sita 101 103 siva 101 104 ganesh 103 . . . . . . for 103 ID the manager ID is 101(RAMA) and for 104 manager is SIVA if i give employee id (EID) you have to tell the manager for that EID write query? eample:if i give 102 .The query output should be manager for 102 ID that it should print RAMA as output
Oracle (3259)
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)