Postgres 16

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select version();

version

PostgreSQL 16.0 (Debian 16.0-1.pgdg120+1) on x86_64-pc-linux-gnu, compiled by gcc (Debian 12.2.0-14) 12.2.0, 64-bit

SELECT 1

CREATE EXTENSION IF NOT EXISTS intarray;

CREATE EXTENSION

SELECT '{3,1,1,2,2,2}'::int[] - '{1}'::int[]

?column?

{2,3}

SELECT 1