On 2/10/2011 2:17 PM, Dan Kubb wrote:
> Database setup:
>
> CREATE TABLE "test" ("letter" VARCHAR(1) PRIMARY KEY, "number" INTEGER
> NOT NULL);
>
> INSERT INTO "test" ("letter", "number") VALUES('b', 1);
> INSERT INTO "test" ("letter", "number") VALUES('a', 2);
> INSERT INTO "test" ("letter", "number") VALUES('c', 2);
>
> Initial query:
>
> SELECT "letter", "number" FROM "test" ORDER BY "letter", "number" LIMIT
> 1;
>
> This returns "a|2", the second row from the results as you would
> expect given that we're sorting on the letter then the number.
> However, here's what I did not expect:
>
> Initial query as a subquery:
>
> SELECT DISTINCT "number" FROM (SELECT "letter", "number" FROM "test"
> ORDER BY "letter", "number" LIMIT 1) AS "test";
>
> This returns "1"
Yes, looks like a bug. If you drop DISTINCT, it returns a single row
with the value 2.
My guess is, DISTINCT is internally implemented as ORDER BY, and that
overrules ORDER BY found in the subquery.
--
Igor Tandetnik
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