What are the sql versions?
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3. Select sum(a) sum_1,max(a) max_1 ,count(a) count_1 from ( ( select 1 a from dual union all Select to_number(‘2011’) a from dual union all select 1 a from dual) union select 2 b from dual);
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What is the purpose of the primary key?
What is the use of cursor ? how cursor allocate context area for executing the sql statement?
What does the file extension accdb stand for?
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