Does a join table need a primary key?
No Answer is Posted For this Question
Be the First to Post Answer
what are the difference between clustered and a non-clustered index? : Sql dba
What is the maximum number of triggers, you can apply on a single table?
What's the difference between inner join and left join?
What is the least restrictive isolation level? : Transact sql
what is outer join? what is selef join? what is difference between them? what is cartecion join?
1 Answers Fiserv, Herbinger, Synechron,
What are % TYPE and % ROWTYPE ? What are the advantages of using these over datatypes?
What is a unique key?
what is a materialized view? : Sql dba
how to write utl file pkg in SQL
Explain spool.
How many row comparison operators are used while working with a subquery?
What is the difference between UNIQUE CONSTRAINT and PRIMARY KEY? 1. There is no difference. 2. A PRIMARY KEY cannot be declared on multiple columns. 3. A UNIQUE CONSTRAINT cannot be declared on multiple columns. 4. A table can have multiple PRIMARY KEYS but only one UNIQUE CONSTRAINT. 5. A table can have multiple UNIQUE CONSTRAINTs but only one PRIMARY KEY.
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)