Обсуждение: BETWEEN

Why is BETWEEN inclusive?  I had assumed that it was like the english
between, which is exclusive.

playpen=# create table numbs ( a int);
CREATE

playpen=# insert into numbs values(1);
INSERT 35913 1
playpen=# insert into numbs values(2);
INSERT 35914 1
playpen=# insert into numbs values(3);
INSERT 35915 1
playpen=# insert into numbs values(4);
INSERT 35916 1
playpen=# insert into numbs values(5);
INSERT 35917 1
playpen=# insert into numbs values(6);
INSERT 35918 1
playpen=# insert into numbs values(7);
INSERT 35919 1
playpen=# select * from numbs where a between 3 and 6;a 
---3456
(4 rows)

Joseph Shraibman <jks@selectacast.net> writes:
> Why is BETWEEN inclusive?

Because the SQL92 spec says so:
        6) "X BETWEEN Y AND Z" is equivalent to "X>=Y AND X<=Z".

> I had assumed that it was like the english
> between, which is exclusive.

That's debatable...
        regards, tom lane