arrays.sql

PostgreSQL7.4.6 for Linux

--
-- 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"}');

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;

SELECT arrtest.a[1],
          arrtest.b[1][1][1],
          arrtest.c[1],
          arrtest.d[1][1], 
          arrtest.e[0]
   FROM arrtest;

SELECT a[1], b[1][1][1], c[1], d[1][1], e[0]
   FROM arrtest;

SELECT a[1:3],
          b[1:1][1:2][1:2],
          c[1:2], 
          d[1:1][1:2]
   FROM arrtest;

SELECT array_dims(a) AS a,array_dims(b) AS b,array_dims(c) AS c
   FROM arrtest;

-- returns nothing 
SELECT *
   FROM arrtest
   WHERE a[1] < 5 and 
         c = '{"foobar"}'::_name;

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;

SELECT a[1:3],
          b[1:1][1:2][1:2],
          c[1:2], 
          d[1:1][2:2]
   FROM arrtest;

--
-- array expressions and operators
--

-- table creation and INSERTs
CREATE TEMP TABLE arrtest2 (i integer ARRAY[4], f float8[], n numeric[], t text[], d timestamp[]);
INSERT INTO arrtest2 VALUES(
  ARRAY[[[113,142],[1,147]]],
  ARRAY[1.1,1.2,1.3]::float8[],
  ARRAY[1.1,1.2,1.3],
  ARRAY[[['aaa','aab'],['aba','abb'],['aca','acb']],[['baa','bab'],['bba','bbb'],['bca','bcb']]],
  ARRAY['19620326','19931223','19970117']::timestamp[]
);

-- some more test data
CREATE TEMP TABLE arrtest_f (f0 int, f1 text, f2 float8);
insert into arrtest_f values(1,'cat1',1.21);
insert into arrtest_f values(2,'cat1',1.24);
insert into arrtest_f values(3,'cat1',1.18);
insert into arrtest_f values(4,'cat1',1.26);
insert into arrtest_f values(5,'cat1',1.15);
insert into arrtest_f values(6,'cat2',1.15);
insert into arrtest_f values(7,'cat2',1.26);
insert into arrtest_f values(8,'cat2',1.32);
insert into arrtest_f values(9,'cat2',1.30);

CREATE TEMP TABLE arrtest_i (f0 int, f1 text, f2 int);
insert into arrtest_i values(1,'cat1',21);
insert into arrtest_i values(2,'cat1',24);
insert into arrtest_i values(3,'cat1',18);
insert into arrtest_i values(4,'cat1',26);
insert into arrtest_i values(5,'cat1',15);
insert into arrtest_i values(6,'cat2',15);
insert into arrtest_i values(7,'cat2',26);
insert into arrtest_i values(8,'cat2',32);
insert into arrtest_i values(9,'cat2',30);

-- expressions
SELECT t.f[1][3][1] AS "131", t.f[2][2][1] AS "221" FROM (
  SELECT ARRAY[[[111,112],[121,122],[131,132]],[[211,212],[221,122],[231,232]]] AS f
) AS t;
SELECT ARRAY[[[[[['hello'],['world']]]]]];
SELECT ARRAY[ARRAY['hello'],ARRAY['world']];
SELECT ARRAY(select f2 from arrtest_f order by f2) AS "ARRAY";

-- functions
SELECT array_append(array[42], 6) AS "{42,6}";
SELECT array_prepend(6, array[42]) AS "{6,42}";
SELECT array_cat(ARRAY[1,2], ARRAY[3,4]) AS "{1,2,3,4}";
SELECT array_cat(ARRAY[1,2], ARRAY[[3,4],[5,6]]) AS "{{1,2},{3,4},{5,6}}";
SELECT array_cat(ARRAY[[3,4],[5,6]], ARRAY[1,2]) AS "{{3,4},{5,6},{1,2}}";

-- operators
SELECT a FROM arrtest WHERE b = ARRAY[[[113,142],[1,147]]];
SELECT NOT ARRAY[1.1,1.2,1.3] = ARRAY[1.1,1.2,1.3] AS "FALSE";
SELECT ARRAY[1,2] || 3 AS "{1,2,3}";
SELECT 0 || ARRAY[1,2] AS "{0,1,2}";
SELECT ARRAY[1,2] || ARRAY[3,4] AS "{1,2,3,4}";
SELECT ARRAY[[['hello','world']]] || ARRAY[[['happy','birthday']]] AS "ARRAY";
SELECT ARRAY[[1,2],[3,4]] || ARRAY[5,6] AS "{{1,2},{3,4},{5,6}}";
SELECT ARRAY[0,0] || ARRAY[1,1] || ARRAY[2,2] AS "{0,0,1,1,2,2}";
SELECT 0 || ARRAY[1,2] || 3 AS "{0,1,2,3}";

-- array casts
SELECT ARRAY[1,2,3]::text[]::int[]::float8[] AS "{1,2,3}";
SELECT ARRAY[1,2,3]::text[]::int[]::float8[] is of (float8[]) as "TRUE";
SELECT ARRAY[['a','bc'],['def','hijk']]::text[]::varchar[] AS "{{a,bc},{def,hijk}}";
SELECT ARRAY[['a','bc'],['def','hijk']]::text[]::varchar[] is of (varchar[]) as "TRUE";
SELECT CAST(ARRAY[[[[[['a','bb','ccc']]]]]] as text[]) as "{{{{{{a,bb,ccc}}}}}}";

-- scalar op any/all (array)
select 33 = any ('{1,2,3}');
select 33 = any ('{1,2,33}');
select 33 = all ('{1,2,33}');
select 33 >= all ('{1,2,33}');
-- boundary cases
select null::int >= all ('{1,2,33}');
select null::int >= all ('{}');
select null::int >= any ('{}');
-- cross-datatype
select 33.4 = any (array[1,2,3]);
select 33.4 > all (array[1,2,3]);
-- errors
select 33 * any ('{1,2,3}');
select 33 * any (44);

-- test indexes on arrays
create temp table arr_tbl (f1 int[] unique);
insert into arr_tbl values ('{1,2,3}');
insert into arr_tbl values ('{1,2}');
-- failure expected:
insert into arr_tbl values ('{1,2,3}');
insert into arr_tbl values ('{2,3,4}');
insert into arr_tbl values ('{1,5,3}');
insert into arr_tbl values ('{1,2,10}');
set enable_seqscan to off;
select * from arr_tbl where f1 > '{1,2,3}' and f1 <= '{1,5,3}';
-- note: if above select doesn't produce the expected tuple order,
-- then you didn't get an indexscan plan, and something is busted.