array_to_string()

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.

Signature

array_to_string ( array anyarray, delimiter text [, null_string text ] ) → text

Examples

SELECT array_to_string(ARRAY[1, 2, 3, NULL, 5], ',', '*');

1,2,3,*,5

Run against PostgreSQL 18.6 on 2026-09-13. This is the output we got, not the documentation’s.

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