[ WITH [ RECURSIVE ] $with_query$ [ , ... ] ] INSERT INTO $table_name$ [ AS $alias$ ] DEFAULT VALUES
    [ ON CONFLICT [ $conflict_target$ ] $conflict_action$ ]
    [ RETURNING { * | { $output_expression$ [ [ AS ] $output_name$ ] } [ , ... ] } ]

[ WITH [ RECURSIVE ] $with_query$ [ , ... ] ] INSERT INTO $table_name$ [ AS $alias$ ] [ ( $column_name$ [ , ... ] ) ]
    { VALUES ( { $expression$ | DEFAULT } [ , ... ] ) [ , ... ] | $query$ }
    [ ON CONFLICT [ $conflict_target$ ] $conflict_action$ ]
    [ RETURNING { * | { $output_expression$ [ [ AS ] $output_name$ ] } [ , ... ] } ]

[ WITH [ RECURSIVE ] $with_query$ [ , ... ] ] INSERT INTO $table_name$ [ AS $alias$ ] [ ( $column_name$ [ , ... ] ) ]
    OVERRIDING { SYSTEM | USER } VALUE { $sub-SELECT$ | ( $sub-SELECT$ ) }
    [ ON CONFLICT [ $conflict_target$ ] $conflict_action$ ]
    [ RETURNING { * | { $output_expression$ [ [ AS ] $output_name$ ] } [ , ... ] } ]

where $conflict_target$ is:

( { { $index_column_name$ | ( $index_expression$ ) } [ COLLATE $collation$ ] [ $opclass$ ] } [ , ... ] ) [ WHERE $index_predicate$ ] |
    ON CONSTRAINT $constraint_name$

where $conflict_action$ is:

DO NOTHING |
    DO UPDATE SET { $column_name$ = { $expression$ | DEFAULT } |
    ( $column_name$ [ , ... ] ) = [ ROW ] ( { $expression$ | DEFAULT } [ , ... ] ) |
    ( $column_name$ [ , ... ] ) = ( $sub-SELECT$ )
    } [ , ... ]
    [ WHERE $condition$ ]