What is the difference between join and union.
- 27 Answers
- 172876 Views
- 3i Infotech, ABC, Oracle, Polaris, TCS, XT Global, I also Faced
- E-Mail Answers
Answer Posted / somashekhar m
Union : The union operator combines the results of two or
more queries into a single result set. But no.of columns
must match in both/all the queries (and also the order)
which are used for union.
Union -- returns with no duplicate rows
Union all -- retruns with duplicate rows (No. of rows
returned = No. of rows in Query1 + No. of rows in Query 2)
Union is a set operator.
You cannot use the union operator within a create view
statement.
You cannot use the union operator on text and image columns.
You cannot use the for browse clause in statements
involving the union operator.
Joins: Joins are used to extract information from more than
one table based on the related column/coloums (PK and RFK)
any no. of rows can be retrived based on matching matching
colums. Different types of joins are Inner join=equi join=
join, outer join(Right outer join/right join, Left outer
join/ left join), Cross join, and full outer join/outer join
| Is This Answer Correct ? | 139 Yes | 20 No |
Post New Answer View All Answers
how many triggers are allowed in mysql table? : Sql dba
What is the difference between syntax error and runtime error?
what is text? : Sql dba
What is nosql vs sql?
What is the best sql course?
What is use of package in pl sql?
What is difference between sql and mysql?
What are user defined functions?
what are all the different types of indexes? : Sql dba
How do you use a while loop in pl sql?
What is audit logout in sql profiler?
What are different categories of sql commands?
Is sql a microsoft product?
Differentiate between sga and pga.
What is sql trigger example?
