Answer / shriram

It is a type of composite data type in pl sql .. The other
two composite types are nested tables and varrays .. example :
TYPE type_name IS TABLE OF NUMBER INDEX BY VARCHAR2(64);
name type_name;

It is also called as index by tables.
Now "name" can be given any values like :

name('raja'):=100;

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Hi, Can anybody please explain me the flow of the below query. I am not able to understand how this query works. This query is for finding the Nth highest salary.. SELECT DISTINCT (a.sal) FROM EMP A WHERE &N = (SELECT COUNT (DISTINCT (b.sal)) FROM EMP B WHERE a.sal<=b.sal); If N = 2 then second highest salary will be the o/p. If N = 3 then third highest salary will be the o/p. and so on.. Thanks, Nitin

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