-- Test basic TRUNCATE functionality.
CREATE TABLE truncate_a (col1 integer primary key);
NOTICE:  CREATE TABLE / PRIMARY KEY will create implicit index 'truncate_a_pkey' for table 'truncate_a'
INSERT INTO truncate_a VALUES (1);
INSERT INTO truncate_a VALUES (2);
SELECT * FROM truncate_a;
 col1 
------
    1
    2
(2 rows)

TRUNCATE truncate_a;
SELECT * FROM truncate_a;
 col1 
------
(0 rows)

-- Test foreign constraint check
CREATE TABLE truncate_b(col1 integer references truncate_a);
NOTICE:  CREATE TABLE will create implicit trigger(s) for FOREIGN KEY check(s)
INSERT INTO truncate_a VALUES (1);
SELECT * FROM truncate_a;
 col1 
------
    1
(1 row)

TRUNCATE truncate_a;
ERROR:  TRUNCATE cannot be used as other tables reference this one via foreign key constraint $1
SELECT * FROM truncate_a;
 col1 
------
    1
(1 row)

DROP TABLE truncate_b;
DROP TABLE truncate_a;