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postgreSQL Data Types


In PostgreSQL you can create Arrays of any built-in, user-defined or enum type. In default there is no limit to an Array, but you can specify it.

Declaring an Array

SELECT integer[];
SELECT integer[3];
SELECT integer[][];
SELECT integer[3][3];
SELECT integer ARRAY[3];

Creating an Array

SELECT '{0,1,2}';
SELECT '{{0,1},{1,2}}';

Accessing an Array

By default PostgreSQL uses a one-based numbering convention for arrays, that is, an array of n elements starts with array[1] and ends with array[n].

--accesing a spefific element
WITH arr AS (SELECT ARRAY[0,1,2] int_arr) SELECT int_arr[1] FROM arr;
(1 row)
--sclicing an array
WITH arr AS (SELECT ARRAY[0,1,2] int_arr) SELECT int_arr[1:2] FROM arr;
(1 row)


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