what is a constraint? Tell me about its various levels. : Sql dba
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declare lowerl number:= 1; upperl number:= 3; num varchar2(10); begin for i into lowerl..upperl loop num:=num||to_char(lowerl); if i=3 then upperl:=5; end loop; message(num); What will be the output ?
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Delete the emps whose salaries are lowest sals of their own dept.
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