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Difference between join and a subquery?
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Answer / kiran
subquery can be used for simple logical queries , to get
required output/condition
but if you want to compare two or more tables and get output
in the way you want it would be lot difficult to manage all
those with subqueries - so we can use the concept of joins
| Is This Answer Correct ? | 39 Yes | 5 No |
Answer / maddy
Subquery is also query which returns one or more values we
can retriew the data based on the where contd="IN,ALL"...
subquery is the query followed by the main query....
join is used to join the two table is used to retriew the
data from 1 or more tables.....
| Is This Answer Correct ? | 27 Yes | 12 No |
Answer / neo devan
A query inside a query or next level query is called
subquery, a subquery can return 1 or more values to the
main query.
Ex: select * from emptable where deptno=(select deptno from
saltable where rownum=1);
A Join is used to query two tables, or views.
Ex: select * from emptable inner join saltable on
emptable.deptno=saltable.deptno;
| Is This Answer Correct ? | 18 Yes | 7 No |
Answer / bhuvana
Joins-
1.Want to combine and fetch data from more than 2 tables.
2.Joins are faster, efficient, easy to understand and better performance.
Subquery-
Want to combine and fetch data from a pair of table.
| Is This Answer Correct ? | 10 Yes | 3 No |
Answer / katty
When data is to be retrieved from one table based on the condition from another table subquery is used
When the data is to be retrieved from both the tables join is used
| Is This Answer Correct ? | 10 Yes | 5 No |
Answer / ashi
Sub query: The sub query has more than one select
statement,the inner query which executes first and then it
will be the value of the 2nd query.
EX:
select ename from emp where sal>(select avg(sal) from emp);
Joins:
When the data from more than one table in the database,then
a join condition used.Rows in the one table can be joined to
rows in the other table according ro the common values
existing in corresponding columns
EX:
select dname,ename from emp,dept where emp.deptid=dept.deptid;
| Is This Answer Correct ? | 9 Yes | 5 No |
Answer / rajasekhar
sub query: it is a query to get the answer for multiple questions
joins: it is used for getting the data from more then two tables
| Is This Answer Correct ? | 4 Yes | 2 No |
Which Oracle App Is Most Popular One ?
create or replace procedure show_tab_rec ( P_tab VARCHAR2 ) IS cmd varchar2(50); begin cmd := 'select * from '|| P_tab; for int in ( execute immediate cmd ) loop dbms_output.put_line ( int.ename||' '||int.deptno); end loop; end; when i m compling this procedure i m getting this error PLS-00103: Encountered the symbol "IMMEDIATE" when expecting one of the following: . ( ) , * @ % & | = - + < / > at in is mod remainder not range rem => .. <an exponent (**)> <> or != or ~= >= <= <> and or like LIKE2_ LIKE4_ LIKEC_ between || multiset member SUBMULTISET_ PLZ solve this error give this question answer asap Thanks advance.......
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