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Little quiz: Ordering/Grouping – Guess the output

Posted on April 28, 2015 by Sayan Malakshinov Posted in curious, oracle, SQL 1,798 Page views Leave a comment

How many times have you guessed the right answer? πŸ™‚

1

[sourcecode language=”SQL”]
select * from dual order by -1;
select * from dual order by 0;
[/sourcecode]

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2

[sourcecode language=”SQL”]
select * from dual order by -(0.1+0/1) desc;
select 1 n,0 n,2 n,0 n,1 n from dual group by grouping sets(1,2,3,2,1,0) order by -(0.1+0/1) desc;
[/sourcecode]

[collapse]
3

[sourcecode language=”SQL”]
select 1 n,0 n,2 n,0 n,1 n from dual group by grouping sets(1,2,3,2,1,0) order by 0;
select 1 n,0 n,2 n,0 n,1 n from dual group by grouping sets(1,2,3,2,1,0) order by 0+0;
select 1 n,0 n,2 n,0 n,1 n from dual group by grouping sets(1,2,3,2,1,0) order by 3+7 desc;
select 1 n,0 n,2 n,0 n,1 n from dual group by grouping sets(1,2,3,2,1,0) order by -(3.1+0f) desc;
[/sourcecode]

[collapse]
4

[sourcecode language=”SQL”]
select column_value x,10-column_value y from table(ku$_objnumset(5,4,3,1,2,3,4)) order by 1.9;
select column_value x,10-column_value y from table(ku$_objnumset(5,4,3,1,2,3,4)) order by 2.5;
select column_value x,10-column_value y from table(ku$_objnumset(5,4,3,1,2,3,4)) order by 2.7 desc;
select column_value x,10-column_value y from table(ku$_objnumset(5,4,3,1,2,3,4)) order by -2.7 desc;
[/sourcecode]

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oracle oracle undocumented behaviour prank quiz undocumented oracle

Friday prank: select from join join join

Posted on February 21, 2014 by Sayan Malakshinov Posted in curious, oracle 2,829 Page views 1 Comment

Valid funny queries πŸ™‚

select the join from join join join using(the,some) 
/
select some join from left join join right using(some,the) 
/
select 1 join from join join join join join using(the) on 1=1
/
select the some from join 
where the=some( the(select some from join) 
               ,the(select the  from join)
               ) 
/ 

tables

[sourcecode language=”sql”]
create table join as select 1 some,1 the from dual;
create table left as select 1 some,1 the from dual;
create table right as select 1 some,1 the from dual;
[/sourcecode]

[collapse]
πŸ™‚

Little addition πŸ™‚

update two tables set join=2;
select join from two tables;
select first, second, random from two tables join three tables on 1=1;

Another one πŸ™‚

select first
     , case when the=some(some,some) then join end true
from two tables join three tables using(random);

….
and…

select random columns from two tables join four tables on the=some(some,some);
friday prank
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