SUBQUERY METHOD
INLINE VIEW METHOD
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An inline view is a SELECT statement in the FROM-clause of another SELECT statement. In the query below the INLINE VIEW is : (SELECT AVG(salary) […]
When you modify existing column with DEFAULT value, then modification to add a DEFAULT value takes effect only from subsequent insertions to […]
This is a tricky behavior of SUM() function which is going to be tested for sure on the exam; We perceive the main […]
When we are using a format mask ( for example with TO_NUMBER function ) we have basically three options : 1 We […]