can we use a having cluase in groupby clause. if there are 500 records i will give rownumber<250 then how many records does it retrieve. wt is the result of nvl2(null,notnull,null) if there are four tables without using cartesian how many joins can be there. in the sql subqueries wt is the parent ans1)select 2)update,3) delete 4)2&3
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