1. Categories >> Software >> Databases >> SQL PLSQL
  2. Suggest New Category

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?

Question Posted / smitha

Answers were Sorted based on User's Feedback



there are 2 variables called x and y ,x contains 1,2 and y contains 3,4 we have to swap the values..

Answer / ravin

Buddies, why are you all selecting from and updating the
tables. The question says, just two variables to be swapped
without using any extra variable and also with a single
statement.
And Ramakanth's answer is right i.e. y=x+y-(x=y) . Thats it.

^^x contains 1,2 - didn't understand though.

Is This Answer Correct ?    13 Yes 2 No

there are 2 variables called x and y ,x contains 1,2 and y contains 3,4 we have to swap the values..

Answer / ramakanth

y=x+y-(x=y)

Is This Answer Correct ?    6 Yes 3 No

there are 2 variables called x and y ,x contains 1,2 and y contains 3,4 we have to swap the values..

Answer / roopesh kumar

declare
x number:= 1;
y number:= 2;
begin
x := x + y;
dbms_output.put_line (x); -- output 3;
y := x - y;
dbms_output.put_line (y); -- output 1;
x := x - y;
dbms_output.put_line (x); -- output 2;
end;
/

Is This Answer Correct ?    8 Yes 5 No

there are 2 variables called x and y ,x contains 1,2 and y contains 3,4 we have to swap the values..

Answer / radha sri seshu.kolla

YES SMITA I HAVE ONE DOUBT IN YOUR QUESTION. X CONTAIN 1,2
HOW ONE VARIABLE CAN HOLD TWO VALUES AT A TIME. TRY TO BE
MORE SPECIFIC IN YOUR QUESTION

Is This Answer Correct ?    3 Yes 0 No

there are 2 variables called x and y ,x contains 1,2 and y contains 3,4 we have to swap the values..

Answer / v

yeah completely agree with u(the above person).The answer
was supposed to be in a single statement and everybody
wrote an history 4 it....hehe
no offence meant

Is This Answer Correct ?    0 Yes 0 No

there are 2 variables called x and y ,x contains 1,2 and y contains 3,4 we have to swap the values..

Answer / divya c

(y!=x)||(x!=y)?x=y,y=x:y=x,x=y;

Is This Answer Correct ?    0 Yes 0 No

there are 2 variables called x and y ,x contains 1,2 and y contains 3,4 we have to swap the values..

Answer / senthil kumar

declare
x number:= 1;
y number:= 3;
begin
x := x + y;
dbms_output.put_line (x); -- output 4;
y := x - y;
dbms_output.put_line (y); -- output 1;
x := x - y;
dbms_output.put_line (x); -- output 3;
end;
/

Now Y got 1 and x got 3 samae way of x = 2, y =4

Is This Answer Correct ?    0 Yes 0 No

there are 2 variables called x and y ,x contains 1,2 and y contains 3,4 we have to swap the values..

Answer / sheshadri

String x="1,2";
String y="3,4";
x=(y+"$"+(y=x)).split("[$]")[0];

Is This Answer Correct ?    0 Yes 0 No

there are 2 variables called x and y ,x contains 1,2 and y contains 3,4 we have to swap the values..

Answer / nanne saheb c

Assume that the sample table is as below
X Y
------------
1 3
2 4

Update sample set
X=decode(X,1,3,2,4),
Y=decode(Y,3,1,4,2);

(OR)
Update sample set
X = (case when 1 then 3
when 2 then 4
end),
Y = (case when 3 then 1
when 4 then 2
end);

Is This Answer Correct ?    1 Yes 1 No

there are 2 variables called x and y ,x contains 1,2 and y contains 3,4 we have to swap the values..

Answer / raji_4u

IF YOU WANT TO UPDATE THE TABLE,

UPDATE TABLE_NAME
SET X = Y, Y = X;

--------------------------
IF YOU WANT TO JUST DISPLAY,

SELECT Y X,X Y FROM TABLE_NAME;

ISN'T THIS SIMPLE THAN SANTHI.K DID.

Is This Answer Correct ?    5 Yes 7 No

Post New Answer

More SQL PLSQL Interview Questions

Show the two pl/sql cursor exceptions.

0 Answers  

why sql is used as interpreter frequently rather than a compile?

1 Answers  

How can we link a sql database to an existing android app?

0 Answers  

How many types of indexes are there in sql?

0 Answers  

What is pivot in sql?

0 Answers  




Does truncate release storage space?

0 Answers  

How to maintain the history of code changes of pl/sql?

3 Answers  

How do you explain an index number?

0 Answers  

What is db journal file?

0 Answers  

What are all the different normalization?

0 Answers  

What is pl sql block in dbms?

0 Answers  

What are the parameter modes supported by pl/sql?

0 Answers  

For more SQL PLSQL Interview Questions Click Here
Categories