Greetings folks,
Doubtless it's all in my mind, but I'd love to know if these are
expected behaviours, if so, please what am I doing wrong?.
chris=# select version();
version
------------------------------------------------------------------------
PostgreSQL 7.1beta3 on i586-pc-linux-gnu, compiled by GCC egcs-2.91.66
(1 row)
Udated about 2 or 3 days ago using cvsup.
chris=# \d subject
Table "subject"
Attribute | Type | Modifier
-----------+-----------------------+--------------------------------------------------------
number | integer | not null default
nextval('"subject_number_seq"'::text)
name | character varying(20) |
Index: subject_pkey
chris=# SELECT count(number) from subject ; # Correct, isn't it?
ERROR: ExecEvalAggref: no aggregates in this expression context
chris=# select * from subject ;
number | name
--------+--------------------
1 | English Language
2 | English Literature
3 | Maori
4 | Samoan
.
.
.
34 | Swimming
35 | Physical Education
36 | Building Science
(36 rows)
The other one is about arrays vis:
chris=# create table array_test ( number serial, data integer[] );
NOTICE: CREATE TABLE will create implicit sequence
'array_test_number_seq' for SERIAL column 'array_test.number'
NOTICE: CREATE TABLE/UNIQUE will create implicit index
'array_test_number_key' for table 'array_test'
CREATE
chris=# \d array_test
Table "array_test"
Attribute | Type | Modifier
-----------+-----------+-----------------------------------------------------------
number | integer | not null default
nextval('"array_test_number_seq"'::text)
data | integer[] |
Index: array_test_number_key
chris=# select * from array_test ;
number | data
--------+------
(0 rows)
chris=# insert into array_test (data) values ( '{}' );
INSERT 174473 1
chris=# select * from array_test ;
number | data
--------+------
4 | {}
(1 row)
chris=# update array_test set data[1]=34 where number=4;
ERROR: Invalid array subscripts
chris=# delete from array_test;
DELETE 1
chris=# insert into array_test (data) values ( '{,}' );
INSERT 174474 1
chris=# select * from array_test ;
number | data
--------+-------
5 | {0,0}
(1 row)
i.e. In order to get the array able to accept any data we have to set
both data[1]=0 and data[2]=0
chris=# update array_test set data[1]=34 where number=5;
UPDATE 1
chris=# select * from array_test ;
number | data
--------+--------
5 | {34,0}
(1 row)
We are left with the unwanted datum element data[2]==0
Is this the expected behaviour?
Thanks a 10^6
--
Sincerely etc.,
NAME Christopher Sawtell
CELL PHONE 021 257 4451
ICQ UIN 45863470
EMAIL csawtell @ xtra . co . nz
CNOTES ftp://ftp.funet.fi/pub/languages/C/tutorials/sawtell_C.tar.gz
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