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|
--
-- ARRAYS
--
CREATE TABLE arrtest (
a int2[],
b int4[][][],
c name[],
d text[][],
e float8[],
f char(5)[],
g varchar(5)[]
);
--
-- only this array as a 0-based 'e', the others are 1-based.
-- 'e' is also a large object.
--
INSERT INTO arrtest (a[5], b[2][1][2], c, d, f, g)
VALUES ('{1,2,3,4,5}', '{{{0,0},{1,2}}}', '{}', '{}', '{}', '{}');
UPDATE arrtest SET e[0] = '1.1';
UPDATE arrtest SET e[1] = '2.2';
INSERT INTO arrtest (f)
VALUES ('{"too long"}');
ERROR: value too long for type character(5)
INSERT INTO arrtest (a, b[2][2][1], c, d, e, f, g)
VALUES ('{11,12,23}', '{{3,4},{4,5}}', '{"foobar"}',
'{{"elt1", "elt2"}}', '{"3.4", "6.7"}',
'{"abc","abcde"}', '{"abc","abcde"}');
INSERT INTO arrtest (a, b[1][2][2], c, d[2][1])
VALUES ('{}', '{3,4}', '{foo,bar}', '{bar,foo}');
SELECT * FROM arrtest;
a | b | c | d | e | f | g
-------------+-----------------+-----------+---------------+-----------+-----------------+-------------
{1,2,3,4,5} | {{{0,0},{1,2}}} | {} | {} | | {} | {}
{11,12,23} | {{3,4},{4,5}} | {foobar} | {{elt1,elt2}} | {3.4,6.7} | {"abc ",abcde} | {abc,abcde}
{} | {3,4} | {foo,bar} | {bar,foo} | | |
(3 rows)
SELECT arrtest.a[1],
arrtest.b[1][1][1],
arrtest.c[1],
arrtest.d[1][1],
arrtest.e[0]
FROM arrtest;
a | b | c | d | e
----+---+--------+------+---
1 | 0 | | |
11 | | foobar | elt1 |
| | foo | |
(3 rows)
SELECT a[1], b[1][1][1], c[1], d[1][1], e[0]
FROM arrtest;
a | b | c | d | e
----+---+--------+------+---
1 | 0 | | |
11 | | foobar | elt1 |
| | foo | |
(3 rows)
SELECT a[1:3],
b[1:1][1:2][1:2],
c[1:2],
d[1:1][1:2]
FROM arrtest;
a | b | c | d
------------+-----------------+-----------+---------------
{1,2,3} | {{{0,0},{1,2}}} | |
{11,12,23} | | {foobar} | {{elt1,elt2}}
| | {foo,bar} |
(3 rows)
SELECT array_dims(a) AS a,array_dims(b) AS b,array_dims(c) AS c
FROM arrtest;
a | b | c
-------+-----------------+-------
[1:5] | [1:1][1:2][1:2] |
[1:3] | [1:2][1:2] | [1:1]
| [1:2] | [1:2]
(3 rows)
-- returns nothing
SELECT *
FROM arrtest
WHERE a[1] < 5 and
c = '{"foobar"}'::_name;
a | b | c | d | e | f | g
---+---+---+---+---+---+---
(0 rows)
UPDATE arrtest
SET a[1:2] = '{16,25}'
WHERE NOT a = '{}'::_int2;
UPDATE arrtest
SET b[1:1][1:1][1:2] = '{113, 117}',
b[1:1][1:2][2:2] = '{142, 147}'
WHERE array_dims(b) = '[1:1][1:2][1:2]';
UPDATE arrtest
SET c[2:2] = '{"new_word"}'
WHERE array_dims(c) is not null;
SELECT a,b,c FROM arrtest;
a | b | c
---------------+-----------------------+-------------------
{16,25,3,4,5} | {{{113,142},{1,147}}} | {}
{} | {3,4} | {foo,new_word}
{16,25,23} | {{3,4},{4,5}} | {foobar,new_word}
(3 rows)
SELECT a[1:3],
b[1:1][1:2][1:2],
c[1:2],
d[1:1][2:2]
FROM arrtest;
a | b | c | d
------------+-----------------------+-------------------+----------
{16,25,3} | {{{113,142},{1,147}}} | |
| | {foo,new_word} |
{16,25,23} | | {foobar,new_word} | {{elt2}}
(3 rows)
|
