On Tue, 7 Oct 2014 12:15:09 +0300
"Tony Papadimitriou" <to...@acm.org> wrote:
> Is there any an equivalent function to the MySQL
> IF(condition,true_expr,false_expr) function?
>
> For example, SELECT AGE,IF(AGE < 3,"BABY",IF(AGE <
> 18,"CHILD","ADULT"));
>
> If not, please add to wish list :)
You can always solve problems like this by putting the data in a table:
create table stages
( age int primary key
, stage string not null
);
insert into stages values (3, 'baby'), (18, 'child'), (999, 'adult');
create view vstages as
select A.age, stage from (
select a.age, min(s.age) as threshold
from ages as a join stages as s
on a.age <= s.age
group by a.age
) as A join stages as s
on A.threshold = s.age;
$ sqlite3 -echo db <<< 'select * from vstages;'
select * from vstages;
age stage
---------- ----------
1 baby
2 baby
3 baby
4 child
5 child
6 child
7 child
8 child
9 child
10 child
11 child
12 child
13 child
14 child
15 child
16 child
17 child
18 child
19 adult
20 adult
21 adult
Another form of the query joins the "stages" table to itself to create
a range, and uses BETWEEN to choose the label.
HTH.
--jkl
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