Madison Kelly <[EMAIL PROTECTED]> writes:
> Here is my full query:
> tle-bu=> EXPLAIN ANALYZE SELECT file_name, file_parent_dir, file_type
> FROM file_info_7 WHERE file_type='d' ORDER BY file_parent_dir ASC,
> file_name ASC;
> This is my index (which I guess is wrong):
> tle-bu=> \d file_info_7_display_idx
> Index "public.file_info_7_display_idx"
> Column | Type
> -----------------+----------------------
> file_type | character varying(2)
> file_parent_dir | text
> file_name | text
> btree, for table "public.file_info_7"
The index is fine, but you need to phrase the query as
... ORDER BY file_type, file_parent_dir, file_name;
(Whether you use ASC or not doesn't matter.) Otherwise the planner
won't make the connection to the sort ordering of the index.
regards, tom lane
---------------------------(end of broadcast)---------------------------
TIP 9: the planner will ignore your desire to choose an index scan if your
joining column's datatypes do not match
