Explain UNION, MINUS, UNION ALL and INTERSECT
Answer posted by Scott on 2005-05-25 18:32:51: UNION - the values of the first query are returned with the values of the second query eliminating duplicates.
MINUS - the values of the first query are returned with duplicates values of the second query removed from the first query.
UNION ALL - the values of both queries are returned including all duplicates
INTERSECT - only the duplicate values are returned from both queries.
Editorial / Best Answerrampratap409
UNION: Take the common record once( No Duplicate)
UNION ALL : Takes Duplicates also
Minus: Result of first query - result of second query
select * from emp where rownum<=9;
select * from emp where rownum<9;
this will display 9th row of emp
Intersect: common result of both query
- Effective test cases
- O2c, p2p, r2r
- Preparing salary sheet
- Internal combustion
- Object and relational view
- Copy data from pds to vsam
- Oracle DBA upgrade concepts
- Why neutral is not used in delta circuit?
- Entropy and enthalpy
- Remove duplicate stage
- Explain product based testing
- Horizontal and vertical clustering
- Single thread and multiple thread
- Hibernate datasource properties
- Adding interface to multiple inheritance in C++ language
- Diplay records using rownum, minus & union
- Etl testing insurance project
- A good tester vs. Good leader
- Manual testing backend process
- Real time claims processing