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x = 3 or x:=3

select a from table into myvar;

insert into x values (1) returning myvar;

https://www.postgresql.org/docs/current/plpgsql-statements.html

DO $$ <anonymous code block> $$ https://www.postgresql.org/docs/12/sql-do.html

raise notice ' % ', x;

DECLARE l_workflow_node_id1 workflow_node.workflow_node_id%TYPE;