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Whatz the main diff between Subquery and a Join
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Answer / a.n.v.v.siva kumar
The main difference between join and sub query is :
join is used to retrieve data from two different tables
where as in sub query we can retreive data from one table
using the result of the where condition on another table.
| Is This Answer Correct ? | 8 Yes | 8 No |
Answer / ramakrishna alla
Above one is exact answer that says sub query is used to get data based on unknown condition (example: select the employee's salary where employee salary greater than clerk) here first we find out clerk salary and then based on his salary we find employee's salary according to above query)
join is used to get the data from atleast 2 tables.
| Is This Answer Correct ? | 0 Yes | 0 No |
Answer / gomolemo kasale
a sub query is a query nested within another query while
join select rows from multiple table
| Is This Answer Correct ? | 0 Yes | 0 No |
Answer / suryakiran
The main usage of subqueries is to retrieve a single record
from that same table or another table.
And also we can use subqueries to retrieve multiple
records,for this we have to use multiple sub queies,instead
of this its better to use joins based on a condition.
We can perform all operations for joins by using subqueries
but it is very complicated.
| Is This Answer Correct ? | 0 Yes | 1 No |
Is it possible to join two tables, that are in two different users (e.g. SCOTT and HR etc.),but im same database (e.g. ORCL)? If yes, then how it is possible? Explain with step by step procedure.
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