array_append(anyarray, anyelement) anyarray append an element to the end of an array array_append(ARRAY[1,2], 3) {1,2,3} array_cat(anyarray, anyarray) anyarray concatenate two arrays array_cat(ARRAY[1,2,3], ARRAY[4,5]) {1,2,3,4,5} array_ndims(anyarray) int returns the number of dimensions of the array array_ndims(ARRAY[[1,2,3], [4,5,6]]) 2 array_dims(anyarray) text returns a text representation of array's dimensions array_dims(ARRAY[[1,2,3], [4,5,6]]) [1:2][1:3] array_fill(anyelement, int[] [, int[]]) anyarray returns an array initialized with supplied value and dimensions, optionally with lower bounds other than 1 array_fill(7, ARRAY[3], ARRAY[2]) [2:4]={7,7,7} array_length(anyarray, int) int returns the length of the requested array dimension array_length(array[1,2,3], 1) 3 array_lower(anyarray, int) int returns lower bound of the requested array dimension array_lower('[0:2]={1,2,3}'::int[], 1) 0 array_prepend(anyelement, anyarray) anyarray append an element to the beginning of an array array_prepend(1, ARRAY[2,3]) {1,2,3} array_remove(anyarray, anyelement) anyarray remove all elements equal to the given value from the array (array must be one-dimensional) array_remove(ARRAY[1,2,3,2], 2) {1,3} array_replace(anyarray, anyelement, anyelement) anyarray replace each array element equal to the given value with a new value array_replace(ARRAY[1,2,5,4], 5, 3) {1,2,3,4} array_to_string(anyarray, text [, text]) text concatenates array elements using supplied delimiter and optional null string array_to_string(ARRAY[1, 2, 3, NULL, 5], ',', '*') 1,2,3,*,5 array_upper(anyarray, int) int returns upper bound of the requested array dimension array_upper(ARRAY[1,8,3,7], 1) 4 cardinality(anyarray) int returns the total number of elements in the array, or 0 if the array is empty cardinality(ARRAY[[1,2],[3,4]]) 4 string_to_array(text, text [, text]) text[] splits string into array elements using supplied delimiter and optional null string string_to_array('xx~^~yy~^~zz', '~^~', 'yy') {xx,NULL,zz} unnest(anyarray) setof anyelement expand an array to a set of rows unnest(ARRAY[1,2])
1 2(2 rows)
unnest(anyarray, anyarray [, ...]) setof anyelement, anyelement [, ...] expand multiple arrays (possibly of different types) to a set of rows. This is only allowed in the FROM clause; see Section 7.2.1.4 unnest(ARRAY[1,2],ARRAY['foo','bar','baz'])
1 foo 2 bar NULL baz(3 rows)
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