Updating multiple rows in oracle


30-Jun-2019 10:59

But the table T1 is relatively small and executing ( select null from t2 where y = x.x ) is very very fast (nice index on t2(y)).Then the exists will be faster as the time to full scan T1 and do the index probe into T2 could be less then the time to simply full scan T2 to build the subquery we need to distinct on.So, when is where exists appropriate and in appropriate?Lets say the result of the subquery ( select y from T2 ) is "huge" and takes a long time.LEFT, RIGHT and FULL OUTER JOINS are the only types of OUTER JOIN.According to cpflames, INNER JOIN means all result rows are rows that were produced by matching some condition between the two tables. Is the word outer optional, since a LEFT JOIN in Oracle is an OUTER JOIN by default? Are those keywords used only to emphasize the nature of the JOIN? LEFT OUTER JOIN, can be very confusing topics, especially for Oracle newbies.If this is the case, I don't understand the usage of "INNER" and "OUTER," since it would be clear that INNER goes only with JOIN or FULL JOIN (same if inner, right? Let's define each of these and explore other commonly asked questions about Oracle joins.

There is one additional type of join besides inner and outer, and that's the CROSS JOIN.Tom Can you illustrate your answer by using the emp dept table.



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But the table T1 is relatively small and executing ( select null from t2 where y = x.x ) is very very fast (nice index on t2(y)).… continue reading »


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