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-- 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)
-- Roll truncate back
BEGIN;
TRUNCATE truncate_a;
ROLLBACK;
SELECT * FROM truncate_a;
col1
------
1
2
(2 rows)
-- Commit the truncate this time
BEGIN;
TRUNCATE truncate_a;
COMMIT;
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 table truncate_b references this one via foreign key constraint $1
SELECT * FROM truncate_a;
col1
------
1
(1 row)
DROP TABLE truncate_b;
DROP TABLE truncate_a;
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