Обсуждение: why does documentation use "END CASE" when that doesn't work

Susan Cassidy <susan.cassidy@decisionsciencescorp.com> writes:
> The documentation says:
> CASE search-expression
>     WHEN expression [, expression [ ... ]] THEN
>       statements
>   [ WHEN expression [, expression [ ... ]] THEN
>       statements
>     ... ]
>   [ ELSE
>       statements ]
> END CASE;

> And it repeats the "END CASE" phrase in other examples.

> However, that doesn't work.  You have to just use "END".

> Shouldn't the documentation be fixed?

No ... you're confusing the SQL CASE expression with the plpgsql CASE
statement.

http://www.postgresql.org/docs/9.3/static/functions-conditional.html

http://www.postgresql.org/docs/9.3/static/plpgsql-control-structures.html#PLPGSQL-CONDITIONALS

It's a bit unfortunate that plpgsql's statement looks enough like the
expression to cause confusion, yet not exactly like the expression.
The decorated END is consistent with other things in plpgsql such as
END IF, though.

            regards, tom lane

plpgsql case use end case，while sql case use end，they are different language

jov