What is correlated sub-query?7 32272
how instead of triger is helpful for mutating tables errors handlling ?2 6336
What are the advantages of the packages6 5989
what are the advantages of primary key over unique+notnull7 13241
how to retrieve the top 3 salaries of the table using rownum30 19671
what is the difference between union and union all14 30414
What is the difference between join and union.27 143570
declare l1 number := null; l2 number :=null; begin if l1=l2 then message('equal'); else if l1<>l2 then message('not equal'); else message('else'); end if; end if; end; What will be the output ?7 7720
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 ?3 4767
Given two tables Student(SID, Name, Course) and Level(SID, level) write the SQL statement to get the name and SID of the student who are taking course = 3 and at freshman level.9 7333
What cursor type do you use to retrieve multiple recordsets?17 45112
Two Methods of retrieving SQL?7 42473
How do you optimize SQL queries ?6 22709
there are 2 variables called x and y ,x contains 1,2 and y contains 3,4 we have to swap the values from x to y and y to x with out using dummy variables and it can be done only by using a single statement ? how?12 9420
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