array_append ( anycompatiblearray, anycompatible ) → anycompatiblearray
Appends an element to the end of an array (same as the anycompatiblearray || anycompatible operator).
array_append(ARRAY[1,2], 3) → {1,2,3}
array_cat ( anycompatiblearray, anycompatiblearray ) → anycompatiblearray
Concatenates two arrays (same as the anycompatiblearray || anycompatiblearray operator).
array_cat(ARRAY[1,2,3], ARRAY[4,5]) → {1,2,3,4,5}
array_dims ( anyarray ) → text
Returns a text representation of the array's dimensions.
array_dims(ARRAY[[1,2,3], [4,5,6]]) → [1:2][1:3]
array_fill ( anyelement, integer[] [, integer[] ] ) → anyarray
Returns an array filled with copies of the given value, having dimensions of the lengths specified by the second argument. The optional third argument supplies lower-bound values for each dimension (which default to all 1).
array_fill(11, ARRAY[2,3]) → {{11,11,11},{11,11,11}}
array_fill(7, ARRAY[3], ARRAY[2]) → [2:4]={7,7,7}
array_length ( anyarray, integer ) → integer
Returns the length of the requested array dimension. (Produces NULL instead of 0 for empty or missing array dimensions.)
array_length(array[1,2,3], 1) → 3
array_length(array[]::int[], 1) → NULL
array_length(array['text'], 2) → NULL
array_lower ( anyarray, integer ) → integer
Returns the lower bound of the requested array dimension.
array_lower('[0:2]={1,2,3}'::integer[], 1) → 0
array_ndims ( anyarray ) → integer
Returns the number of dimensions of the array.
array_ndims(ARRAY[[1,2,3], [4,5,6]]) → 2
array_position ( anycompatiblearray, anycompatible [, integer ] ) → integer
Returns the subscript of the first occurrence of the second argument in the array, or NULL if it's not present. If the third argument is given, the search begins at that subscript. The array must be one-dimensional. Comparisons are done using IS NOT DISTINCT FROM semantics, so it is possible to search for NULL.
array_position(ARRAY['sun', 'mon', 'tue', 'wed', 'thu', 'fri', 'sat'], 'mon') → 2
array_positions ( anycompatiblearray, anycompatible ) → integer[]
Returns an array of the subscripts of all occurrences of the second argument in the array given as first argument. The array must be one-dimensional. Comparisons are done using IS NOT DISTINCT FROM semantics, so it is possible to search for NULL. NULL is returned only if the array is NULL; if the value is not found in the array, an empty array is returned.
array_positions(ARRAY['A','A','B','A'], 'A') → {1,2,4}
array_prepend ( anycompatible, anycompatiblearray ) → anycompatiblearray
Prepends an element to the beginning of an array (same as the anycompatible || anycompatiblearray operator).
array_prepend(1, ARRAY[2,3]) → {1,2,3}
array_remove ( anycompatiblearray, anycompatible ) → anycompatiblearray
Removes all elements equal to the given value from the array. The array must be one-dimensional. Comparisons are done using IS NOT DISTINCT FROM semantics, so it is possible to remove NULLs.
array_remove(ARRAY[1,2,3,2], 2) → {1,3}
array_replace ( anycompatiblearray, anycompatible, anycompatible ) → anycompatiblearray
Replaces each array element equal to the second argument with the third argument.
array_replace(ARRAY[1,2,5,4], 5, 3) → {1,2,3,4}
array_sample ( array anyarray, n integer ) → anyarray
Returns an array of n items randomly selected from array. n may not exceed the length of array's first dimension. If array is multi-dimensional, an “item” is a slice having a given first subscript.
array_sample(ARRAY[1,2,3,4,5,6], 3) → {2,6,1}
array_sample(ARRAY[[1,2],[3,4],[5,6]], 2) → {{5,6},{1,2}}
array_shuffle ( anyarray ) → anyarray
Randomly shuffles the first dimension of the array.
array_shuffle(ARRAY[[1,2],[3,4],[5,6]]) → {{5,6},{1,2},{3,4}}
array_to_string ( array anyarray, delimiter text [, null_string text ] ) → text
Converts each array element to its text representation, and concatenates those separated by the delimiter string. If null_string is given and is not NULL, then NULL array entries are represented by that string; otherwise, they are omitted. See also string_to_array.
array_to_string(ARRAY[1, 2, 3, NULL, 5], ',', '*') → 1,2,3,*,5
array_upper ( anyarray, integer ) → integer
Returns the upper bound of the requested array dimension.
array_upper(ARRAY[1,8,3,7], 1) → 4
cardinality ( anyarray ) → integer
Returns the total number of elements in the array, or 0 if the array is empty.
cardinality(ARRAY[[1,2],[3,4]]) → 4
trim_array ( array anyarray, n integer ) → anyarray
Trims an array by removing the last n elements. If the array is multidimensional, only the first dimension is trimmed.
trim_array(ARRAY[1,2,3,4,5,6], 2) → {1,2,3,4}
unnest ( anyarray ) → setof anyelement
Expands an array into a set of rows. The array's elements are read out in storage order.
unnest(ARRAY[1,2]) →
1 2
unnest(ARRAY[['foo','bar'],['baz','quux']]) →
foo bar baz quux
unnest ( anyarray, anyarray [, ... ] ) → setof anyelement, anyelement [, ... ]
Expands multiple arrays (possibly of different data types) into a set of rows. If the arrays are not all the same length then the shorter ones are padded with NULLs. This form is only allowed in a query's FROM clause; see Section 7.2.1.4.
select * from unnest(ARRAY[1,2], ARRAY['foo','bar','baz']) as x(a,b) →
a | b ---+----- 1 | foo 2 | bar | baz
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