diff --git a/src/test/regress/input/constraints.source b/src/test/regress/input/constraints.source
index 88f6c26337..1c5c0d64f1 100644
--- a/src/test/regress/input/constraints.source
+++ b/src/test/regress/input/constraints.source
@@ -1,6 +1,10 @@
 --
 -- Check constraints
--- Constraints can be specified with either DEFAULT or CHECK clauses.
+-- Constraints can be specified with:
+--  - DEFAULT clause
+--  - CHECK clauses
+--  - PRIMARY KEY clauses
+--  - UNIQUE clauses
 --
 
 --
@@ -8,24 +12,26 @@
 --
 
 CREATE TABLE DEFAULT_TBL (i int DEFAULT 100,
- x text DEFAULT 'vadim', f float8 DEFAULT 123.456);
+	x text DEFAULT 'vadim', f float8 DEFAULT 123.456);
 
 INSERT INTO DEFAULT_TBL VALUES (1, 'thomas', 57.0613);
 INSERT INTO DEFAULT_TBL VALUES (1, 'bruce');
 INSERT INTO DEFAULT_TBL (i, f) VALUES (2, 987.654);
-INSERT INTO DEFAULT_TBL (x) VALUES ('tgl');
+INSERT INTO DEFAULT_TBL (x) VALUES ('marc');
 INSERT INTO DEFAULT_TBL VALUES (3, null, 1.0);
 
-SELECT '' AS four, * FROM DEFAULT_TBL;
+SELECT '' AS five, * FROM DEFAULT_TBL;
 
 CREATE SEQUENCE DEFAULT_SEQ;
+
 CREATE TABLE DEFAULTEXPR_TBL (i1 int DEFAULT 100 + (200-199) * 2,
- i2 int DEFAULT nextval('default_seq'));
+	i2 int DEFAULT nextval('default_seq'));
 
 INSERT INTO DEFAULTEXPR_TBL VALUES (-1, -2);
 INSERT INTO DEFAULTEXPR_TBL (i1) VALUES (-3);
 INSERT INTO DEFAULTEXPR_TBL (i2) VALUES (-4);
 INSERT INTO DEFAULTEXPR_TBL (i2) VALUES (NULL);
+
 SELECT '' AS four, * FROM DEFAULTEXPR_TBL;
 
 -- errors
@@ -39,8 +45,8 @@ CREATE TABLE error_tbl (b1 bool DEFAULT 1 < 2);
 -- CHECK syntax
 --
 
-CREATE TABLE CHECK_TBL (x int) 
- CONSTRAINT CHECK_CON CHECK (x > 3);
+CREATE TABLE CHECK_TBL (x int,
+	CONSTRAINT CHECK_CON CHECK (x > 3));
 
 INSERT INTO CHECK_TBL VALUES (5);
 INSERT INTO CHECK_TBL VALUES (4);
@@ -49,9 +55,14 @@ INSERT INTO CHECK_TBL VALUES (2);
 INSERT INTO CHECK_TBL VALUES (6);
 INSERT INTO CHECK_TBL VALUES (1);
 
+SELECT '' AS three, * FROM CHECK_TBL;
+
 CREATE SEQUENCE CHECK_SEQ;
-CREATE TABLE CHECK2_TBL (x int, y text, z int) 
- CONSTRAINT SEQUENCE_CON CHECK (x > 3 and y <> 'check failed' and x < 8);
+
+CREATE TABLE CHECK2_TBL (x int, y text, z int,
+	CONSTRAINT SEQUENCE_CON
+	CHECK (x > 3 and y <> 'check failed' and z < 8));
+
 INSERT INTO CHECK2_TBL VALUES (4, 'check ok', -2);
 INSERT INTO CHECK2_TBL VALUES (1, 'x check failed', -2);
 INSERT INTO CHECK2_TBL VALUES (5, 'z check failed', 10);
@@ -59,6 +70,8 @@ INSERT INTO CHECK2_TBL VALUES (0, 'check failed', -2);
 INSERT INTO CHECK2_TBL VALUES (6, 'check failed', 11);
 INSERT INTO CHECK2_TBL VALUES (7, 'check ok', 7);
 
+SELECT '' AS two, * from CHECK2_TBL;
+
 --
 -- Check constraints on INSERT
 --
@@ -66,15 +79,16 @@ INSERT INTO CHECK2_TBL VALUES (7, 'check ok', 7);
 CREATE SEQUENCE INSERT_SEQ;
 
 CREATE TABLE INSERT_TBL (x INT DEFAULT nextval('insert_seq'),
-y TEXT DEFAULT '-NULL-', z INT DEFAULT -1 * currval('insert_seq') ) 
-CONSTRAINT INSERT_CON CHECK (x >= 3 AND y <> 'check failed' AND x < 8), 
-CHECK x + z = 0;
+	y TEXT DEFAULT '-NULL-', z INT DEFAULT -1 * currval('insert_seq'),
+	CONSTRAINT INSERT_CON CHECK (x >= 3 AND y <> 'check failed' AND x < 8), 
+		CHECK (x + z = 0));
 
 INSERT INTO INSERT_TBL VALUES (null, null, null);
 INSERT INTO INSERT_TBL(x,z) VALUES (2, -2);
 
-SELECT * FROM INSERT_TBL;
-SELECT nextval('insert_seq');
+SELECT '' AS zero, * FROM INSERT_TBL;
+
+SELECT 'one' AS one, nextval('insert_seq');
 
 INSERT INTO INSERT_TBL(y) VALUES ('Y');
 INSERT INTO INSERT_TBL(y) VALUES ('Y');
@@ -83,15 +97,21 @@ INSERT INTO INSERT_TBL(z,x) VALUES (-7,  7);
 INSERT INTO INSERT_TBL VALUES (5, 'check failed', -5);
 INSERT INTO INSERT_TBL VALUES (7, '!check failed', -7);
 INSERT INTO INSERT_TBL(y) VALUES ('-!NULL-');
-SELECT * FROM INSERT_TBL;
+
+SELECT '' AS four, * FROM INSERT_TBL;
+
 INSERT INTO INSERT_TBL(y,z) VALUES ('check failed', 4);
 INSERT INTO INSERT_TBL(x,y) VALUES (5, 'check failed');
 INSERT INTO INSERT_TBL(x,y) VALUES (5, '!check failed');
 INSERT INTO INSERT_TBL(y) VALUES ('-!NULL-');
-SELECT * FROM INSERT_TBL;
-SELECT nextval('insert_seq');
+
+SELECT '' AS six, * FROM INSERT_TBL;
+
+SELECT 'seven' AS one, nextval('insert_seq');
+
 INSERT INTO INSERT_TBL(y) VALUES ('Y');
-SELECT currval('insert_seq');
+
+SELECT 'eight' AS one, currval('insert_seq');
 
 --
 -- Check constraints on INSERT INTO
@@ -99,18 +119,23 @@ SELECT currval('insert_seq');
 
 DELETE FROM INSERT_TBL;
 DROP SEQUENCE INSERT_SEQ;
+
 CREATE SEQUENCE INSERT_SEQ START 4;
+
 CREATE TABLE TEMP (xd INT, yd TEXT, zd INT);
 
 INSERT INTO TEMP VALUES (null, 'Y', null);
 INSERT INTO TEMP VALUES (5, '!check failed', null);
 INSERT INTO TEMP VALUES (null, 'try again', null);
 INSERT INTO INSERT_TBL(y) select yd from TEMP;
-SELECT * FROM INSERT_TBL;
+
+SELECT '' AS three, * FROM INSERT_TBL;
+
 INSERT INTO INSERT_TBL SELECT * FROM TEMP WHERE yd = 'try again';
 INSERT INTO INSERT_TBL(y,z) SELECT yd, -7 FROM TEMP WHERE yd = 'try again';
 INSERT INTO INSERT_TBL(y,z) SELECT yd, -8 FROM TEMP WHERE yd = 'try again';
-SELECT * FROM INSERT_TBL;
+
+SELECT '' AS four, * FROM INSERT_TBL;
 
 DROP TABLE TEMP;
 
@@ -122,17 +147,87 @@ UPDATE INSERT_TBL SET x = NULL WHERE x = 6;
 UPDATE INSERT_TBL SET x = 6 WHERE x = 6;
 UPDATE INSERT_TBL SET x = -z, z = -x;
 UPDATE INSERT_TBL SET x = z, z = x;
+
 SELECT * FROM INSERT_TBL;
 
+-- DROP TABLE INSERT_TBL;
+
 --
 -- Check constraints on COPY FROM
 --
 
-CREATE TABLE COPY_TBL (x INT, y TEXT, z INT) 
- CONSTRAINT COPY_CON CHECK (x > 3 AND y <> 'check failed' AND x < 7 );
+CREATE TABLE COPY_TBL (x INT, y TEXT, z INT,
+	CONSTRAINT COPY_CON
+	CHECK (x > 3 AND y <> 'check failed' AND x < 7 ));
 
 COPY COPY_TBL FROM '_OBJWD_/data/constro.data';
-SELECT * FROM COPY_TBL;
+
+SELECT '' AS two, * FROM COPY_TBL;
+
 COPY COPY_TBL FROM '_OBJWD_/data/constrf.data';
 
 SELECT * FROM COPY_TBL;
+
+--
+-- Primary keys
+--
+
+CREATE TABLE PRIMARY_TBL (i int PRIMARY KEY, t text);
+
+INSERT INTO PRIMARY_TBL VALUES (1, 'one');
+INSERT INTO PRIMARY_TBL VALUES (2, 'two');
+INSERT INTO PRIMARY_TBL VALUES (1, 'three');
+INSERT INTO PRIMARY_TBL VALUES (4, 'three');
+INSERT INTO PRIMARY_TBL VALUES (5, 'one');
+INSERT INTO PRIMARY_TBL (t) VALUES ('six');
+
+SELECT '' AS four, * FROM PRIMARY_TBL;
+
+DROP TABLE PRIMARY_TBL;
+
+CREATE TABLE PRIMARY_TBL (i int, t text,
+	PRIMARY KEY(i,t));
+
+INSERT INTO PRIMARY_TBL VALUES (1, 'one');
+INSERT INTO PRIMARY_TBL VALUES (2, 'two');
+INSERT INTO PRIMARY_TBL VALUES (1, 'three');
+INSERT INTO PRIMARY_TBL VALUES (4, 'three');
+INSERT INTO PRIMARY_TBL VALUES (5, 'one');
+INSERT INTO PRIMARY_TBL (t) VALUES ('six');
+
+SELECT '' AS three, * FROM PRIMARY_TBL;
+
+DROP TABLE PRIMARY_TBL;
+
+--
+-- Unique keys
+--
+
+CREATE TABLE UNIQUE_TBL (i int UNIQUE, t text);
+
+INSERT INTO UNIQUE_TBL VALUES (1, 'one');
+INSERT INTO UNIQUE_TBL VALUES (2, 'two');
+INSERT INTO UNIQUE_TBL VALUES (1, 'three');
+INSERT INTO UNIQUE_TBL VALUES (4, 'four');
+INSERT INTO UNIQUE_TBL VALUES (5, 'one');
+INSERT INTO UNIQUE_TBL (t) VALUES ('six');
+INSERT INTO UNIQUE_TBL (t) VALUES ('seven');
+
+SELECT '' AS five, * FROM UNIQUE_TBL;
+
+DROP TABLE UNIQUE_TBL;
+
+CREATE TABLE UNIQUE_TBL (i int, t text,
+	UNIQUE(i,t));
+
+INSERT INTO UNIQUE_TBL VALUES (1, 'one');
+INSERT INTO UNIQUE_TBL VALUES (2, 'two');
+INSERT INTO UNIQUE_TBL VALUES (1, 'three');
+INSERT INTO UNIQUE_TBL VALUES (1, 'one');
+INSERT INTO UNIQUE_TBL VALUES (5, 'one');
+INSERT INTO UNIQUE_TBL (t) VALUES ('six');
+
+SELECT '' AS five, * FROM UNIQUE_TBL;
+
+DROP TABLE UNIQUE_TBL;
+
diff --git a/src/test/regress/output/constraints.source b/src/test/regress/output/constraints.source
index 7d5a751ccd..3f35b0e4b0 100644
--- a/src/test/regress/output/constraints.source
+++ b/src/test/regress/output/constraints.source
@@ -1,23 +1,23 @@
 QUERY: CREATE TABLE DEFAULT_TBL (i int DEFAULT 100,
- x text DEFAULT 'vadim', f float8 DEFAULT 123.456);
+	x text DEFAULT 'vadim', f float8 DEFAULT 123.456);
 QUERY: INSERT INTO DEFAULT_TBL VALUES (1, 'thomas', 57.0613);
 QUERY: INSERT INTO DEFAULT_TBL VALUES (1, 'bruce');
 QUERY: INSERT INTO DEFAULT_TBL (i, f) VALUES (2, 987.654);
-QUERY: INSERT INTO DEFAULT_TBL (x) VALUES ('tgl');
+QUERY: INSERT INTO DEFAULT_TBL (x) VALUES ('marc');
 QUERY: INSERT INTO DEFAULT_TBL VALUES (3, null, 1.0);
-QUERY: SELECT '' AS four, * FROM DEFAULT_TBL;
-four|  i|x     |      f
+QUERY: SELECT '' AS five, * FROM DEFAULT_TBL;
+five|  i|x     |      f
 ----+---+------+-------
     |  1|thomas|57.0613
     |  1|bruce |123.456
     |  2|vadim |987.654
-    |100|tgl   |123.456
+    |100|marc  |123.456
     |  3|      |      1
 (5 rows)
 
 QUERY: CREATE SEQUENCE DEFAULT_SEQ;
 QUERY: CREATE TABLE DEFAULTEXPR_TBL (i1 int DEFAULT 100 + (200-199) * 2,
- i2 int DEFAULT nextval('default_seq'));
+	i2 int DEFAULT nextval('default_seq'));
 QUERY: INSERT INTO DEFAULTEXPR_TBL VALUES (-1, -2);
 QUERY: INSERT INTO DEFAULTEXPR_TBL (i1) VALUES (-3);
 QUERY: INSERT INTO DEFAULTEXPR_TBL (i2) VALUES (-4);
@@ -35,8 +35,8 @@ QUERY: CREATE TABLE error_tbl (i int DEFAULT (100, ));
 WARN:parser: parse error at or near ","
 QUERY: CREATE TABLE error_tbl (b1 bool DEFAULT 1 < 2);
 WARN:boolean expressions not supported in DEFAULT
-QUERY: CREATE TABLE CHECK_TBL (x int)
- CONSTRAINT CHECK_CON CHECK (x > 3);
+QUERY: CREATE TABLE CHECK_TBL (x int,
+	CONSTRAINT CHECK_CON CHECK (x > 3));
 QUERY: INSERT INTO CHECK_TBL VALUES (5);
 QUERY: INSERT INTO CHECK_TBL VALUES (4);
 QUERY: INSERT INTO CHECK_TBL VALUES (3);
@@ -46,36 +46,53 @@ WARN:ExecAppend: rejected due to CHECK constraint check_con
 QUERY: INSERT INTO CHECK_TBL VALUES (6);
 QUERY: INSERT INTO CHECK_TBL VALUES (1);
 WARN:ExecAppend: rejected due to CHECK constraint check_con
+QUERY: SELECT '' AS three, * FROM CHECK_TBL;
+three|x
+-----+-
+     |5
+     |4
+     |6
+(3 rows)
+
 QUERY: CREATE SEQUENCE CHECK_SEQ;
-QUERY: CREATE TABLE CHECK2_TBL (x int, y text, z int)
- CONSTRAINT SEQUENCE_CON CHECK (x > 3 and y <> 'check failed' and x < 8);
+QUERY: CREATE TABLE CHECK2_TBL (x int, y text, z int,
+	CONSTRAINT SEQUENCE_CON
+	CHECK (x > 3 and y <> 'check failed' and z < 8));
 QUERY: INSERT INTO CHECK2_TBL VALUES (4, 'check ok', -2);
 QUERY: INSERT INTO CHECK2_TBL VALUES (1, 'x check failed', -2);
 WARN:ExecAppend: rejected due to CHECK constraint sequence_con
 QUERY: INSERT INTO CHECK2_TBL VALUES (5, 'z check failed', 10);
+WARN:ExecAppend: rejected due to CHECK constraint sequence_con
 QUERY: INSERT INTO CHECK2_TBL VALUES (0, 'check failed', -2);
 WARN:ExecAppend: rejected due to CHECK constraint sequence_con
 QUERY: INSERT INTO CHECK2_TBL VALUES (6, 'check failed', 11);
 WARN:ExecAppend: rejected due to CHECK constraint sequence_con
 QUERY: INSERT INTO CHECK2_TBL VALUES (7, 'check ok', 7);
+QUERY: SELECT '' AS two, * from CHECK2_TBL;
+two|x|y       | z
+---+-+--------+--
+   |4|check ok|-2
+   |7|check ok| 7
+(2 rows)
+
 QUERY: CREATE SEQUENCE INSERT_SEQ;
 QUERY: CREATE TABLE INSERT_TBL (x INT DEFAULT nextval('insert_seq'),
-y TEXT DEFAULT '-NULL-', z INT DEFAULT -1 * currval('insert_seq') )
-CONSTRAINT INSERT_CON CHECK (x >= 3 AND y <> 'check failed' AND x < 8),
-CHECK x + z = 0;
+	y TEXT DEFAULT '-NULL-', z INT DEFAULT -1 * currval('insert_seq'),
+	CONSTRAINT INSERT_CON CHECK (x >= 3 AND y <> 'check failed' AND x < 8),
+		CHECK (x + z = 0));
 QUERY: INSERT INTO INSERT_TBL VALUES (null, null, null);
 WARN:ExecAppend: rejected due to CHECK constraint $2
 QUERY: INSERT INTO INSERT_TBL(x,z) VALUES (2, -2);
 WARN:ExecAppend: rejected due to CHECK constraint insert_con
-QUERY: SELECT * FROM INSERT_TBL;
-x|y|z
--+-+-
+QUERY: SELECT '' AS zero, * FROM INSERT_TBL;
+zero|x|y|z
+----+-+-+-
 (0 rows)
 
-QUERY: SELECT nextval('insert_seq');
-nextval
--------
-      1
+QUERY: SELECT 'one' AS one, nextval('insert_seq');
+one|nextval
+---+-------
+one|      1
 (1 row)
 
 QUERY: INSERT INTO INSERT_TBL(y) VALUES ('Y');
@@ -88,13 +105,13 @@ QUERY: INSERT INTO INSERT_TBL VALUES (5, 'check failed', -5);
 WARN:ExecAppend: rejected due to CHECK constraint insert_con
 QUERY: INSERT INTO INSERT_TBL VALUES (7, '!check failed', -7);
 QUERY: INSERT INTO INSERT_TBL(y) VALUES ('-!NULL-');
-QUERY: SELECT * FROM INSERT_TBL;
-x|y            | z
--+-------------+--
-3|Y            |-3
-7|-NULL-       |-7
-7|!check failed|-7
-4|-!NULL-      |-4
+QUERY: SELECT '' AS four, * FROM INSERT_TBL;
+four|x|y            | z
+----+-+-------------+--
+    |3|Y            |-3
+    |7|-NULL-       |-7
+    |7|!check failed|-7
+    |4|-!NULL-      |-4
 (4 rows)
 
 QUERY: INSERT INTO INSERT_TBL(y,z) VALUES ('check failed', 4);
@@ -103,29 +120,29 @@ QUERY: INSERT INTO INSERT_TBL(x,y) VALUES (5, 'check failed');
 WARN:ExecAppend: rejected due to CHECK constraint insert_con
 QUERY: INSERT INTO INSERT_TBL(x,y) VALUES (5, '!check failed');
 QUERY: INSERT INTO INSERT_TBL(y) VALUES ('-!NULL-');
-QUERY: SELECT * FROM INSERT_TBL;
-x|y            | z
--+-------------+--
-3|Y            |-3
-7|-NULL-       |-7
-7|!check failed|-7
-4|-!NULL-      |-4
-5|!check failed|-5
-6|-!NULL-      |-6
+QUERY: SELECT '' AS six, * FROM INSERT_TBL;
+six|x|y            | z
+---+-+-------------+--
+   |3|Y            |-3
+   |7|-NULL-       |-7
+   |7|!check failed|-7
+   |4|-!NULL-      |-4
+   |5|!check failed|-5
+   |6|-!NULL-      |-6
 (6 rows)
 
-QUERY: SELECT nextval('insert_seq');
-nextval
--------
-      7
+QUERY: SELECT 'seven' AS one, nextval('insert_seq');
+one  |nextval
+-----+-------
+seven|      7
 (1 row)
 
 QUERY: INSERT INTO INSERT_TBL(y) VALUES ('Y');
 WARN:ExecAppend: rejected due to CHECK constraint insert_con
-QUERY: SELECT currval('insert_seq');
-currval
--------
-      8
+QUERY: SELECT 'eight' AS one, currval('insert_seq');
+one  |currval
+-----+-------
+eight|      8
 (1 row)
 
 QUERY: DELETE FROM INSERT_TBL;
@@ -137,12 +154,12 @@ QUERY: INSERT INTO TEMP VALUES (5, '!check failed', null);
 QUERY: INSERT INTO TEMP VALUES (null, 'try again', null);
 QUERY: INSERT INTO INSERT_TBL(y) select yd from TEMP;
 NOTICE:insert_seq.nextval: sequence was re-created
-QUERY: SELECT * FROM INSERT_TBL;
-x|y            | z
--+-------------+--
-4|Y            |-4
-5|!check failed|-5
-6|try again    |-6
+QUERY: SELECT '' AS three, * FROM INSERT_TBL;
+three|x|y            | z
+-----+-+-------------+--
+     |4|Y            |-4
+     |5|!check failed|-5
+     |6|try again    |-6
 (3 rows)
 
 QUERY: INSERT INTO INSERT_TBL SELECT * FROM TEMP WHERE yd = 'try again';
@@ -150,13 +167,13 @@ WARN:ExecAppend: rejected due to CHECK constraint $2
 QUERY: INSERT INTO INSERT_TBL(y,z) SELECT yd, -7 FROM TEMP WHERE yd = 'try again';
 QUERY: INSERT INTO INSERT_TBL(y,z) SELECT yd, -8 FROM TEMP WHERE yd = 'try again';
 WARN:ExecAppend: rejected due to CHECK constraint insert_con
-QUERY: SELECT * FROM INSERT_TBL;
-x|y            | z
--+-------------+--
-4|Y            |-4
-5|!check failed|-5
-6|try again    |-6
-7|try again    |-7
+QUERY: SELECT '' AS four, * FROM INSERT_TBL;
+four|x|y            | z
+----+-+-------------+--
+    |4|Y            |-4
+    |5|!check failed|-5
+    |6|try again    |-6
+    |7|try again    |-7
 (4 rows)
 
 QUERY: DROP TABLE TEMP;
@@ -175,14 +192,15 @@ x|y            | z
 6|try again    |-6
 (4 rows)
 
-QUERY: CREATE TABLE COPY_TBL (x INT, y TEXT, z INT)
- CONSTRAINT COPY_CON CHECK (x > 3 AND y <> 'check failed' AND x < 7 );
+QUERY: CREATE TABLE COPY_TBL (x INT, y TEXT, z INT,
+	CONSTRAINT COPY_CON
+	CHECK (x > 3 AND y <> 'check failed' AND x < 7 ));
 QUERY: COPY COPY_TBL FROM '_OBJWD_/data/constro.data';
-QUERY: SELECT * FROM COPY_TBL;
-x|y            |z
--+-------------+-
-4|!check failed|5
-6|OK           |4
+QUERY: SELECT '' AS two, * FROM COPY_TBL;
+two|x|y            |z
+---+-+-------------+-
+   |4|!check failed|5
+   |6|OK           |4
 (2 rows)
 
 QUERY: COPY COPY_TBL FROM '_OBJWD_/data/constrf.data';
@@ -194,3 +212,83 @@ x|y            |z
 6|OK           |4
 (2 rows)
 
+QUERY: CREATE TABLE PRIMARY_TBL (i int PRIMARY KEY, t text);
+QUERY: INSERT INTO PRIMARY_TBL VALUES (1, 'one');
+QUERY: INSERT INTO PRIMARY_TBL VALUES (2, 'two');
+QUERY: INSERT INTO PRIMARY_TBL VALUES (1, 'three');
+WARN:Cannot insert a duplicate key into a unique index.
+QUERY: INSERT INTO PRIMARY_TBL VALUES (4, 'three');
+QUERY: INSERT INTO PRIMARY_TBL VALUES (5, 'one');
+QUERY: INSERT INTO PRIMARY_TBL (t) VALUES ('six');
+WARN:ExecAppend: Fail to add null value in not null attribute i
+QUERY: SELECT '' AS four, * FROM PRIMARY_TBL;
+four|i|t    
+----+-+-----
+    |1|one  
+    |2|two  
+    |4|three
+    |5|one  
+(4 rows)
+
+QUERY: DROP TABLE PRIMARY_TBL;
+QUERY: CREATE TABLE PRIMARY_TBL (i int, t text,
+	PRIMARY KEY(i,t));
+QUERY: INSERT INTO PRIMARY_TBL VALUES (1, 'one');
+QUERY: INSERT INTO PRIMARY_TBL VALUES (2, 'two');
+QUERY: INSERT INTO PRIMARY_TBL VALUES (1, 'three');
+QUERY: INSERT INTO PRIMARY_TBL VALUES (4, 'three');
+QUERY: INSERT INTO PRIMARY_TBL VALUES (5, 'one');
+QUERY: INSERT INTO PRIMARY_TBL (t) VALUES ('six');
+WARN:ExecAppend: Fail to add null value in not null attribute i
+QUERY: SELECT '' AS three, * FROM PRIMARY_TBL;
+three|i|t    
+-----+-+-----
+     |1|one  
+     |2|two  
+     |1|three
+     |4|three
+     |5|one  
+(5 rows)
+
+QUERY: DROP TABLE PRIMARY_TBL;
+QUERY: CREATE TABLE UNIQUE_TBL (i int UNIQUE, t text);
+QUERY: INSERT INTO UNIQUE_TBL VALUES (1, 'one');
+QUERY: INSERT INTO UNIQUE_TBL VALUES (2, 'two');
+QUERY: INSERT INTO UNIQUE_TBL VALUES (1, 'three');
+WARN:Cannot insert a duplicate key into a unique index.
+QUERY: INSERT INTO UNIQUE_TBL VALUES (4, 'four');
+QUERY: INSERT INTO UNIQUE_TBL VALUES (5, 'one');
+QUERY: INSERT INTO UNIQUE_TBL (t) VALUES ('six');
+QUERY: INSERT INTO UNIQUE_TBL (t) VALUES ('seven');
+QUERY: SELECT '' AS five, * FROM UNIQUE_TBL;
+five|i|t    
+----+-+-----
+    |1|one  
+    |2|two  
+    |4|four 
+    |5|one  
+    | |six  
+    | |seven
+(6 rows)
+
+QUERY: DROP TABLE UNIQUE_TBL;
+QUERY: CREATE TABLE UNIQUE_TBL (i int, t text,
+	UNIQUE(i,t));
+QUERY: INSERT INTO UNIQUE_TBL VALUES (1, 'one');
+QUERY: INSERT INTO UNIQUE_TBL VALUES (2, 'two');
+QUERY: INSERT INTO UNIQUE_TBL VALUES (1, 'three');
+QUERY: INSERT INTO UNIQUE_TBL VALUES (1, 'one');
+WARN:Cannot insert a duplicate key into a unique index.
+QUERY: INSERT INTO UNIQUE_TBL VALUES (5, 'one');
+QUERY: INSERT INTO UNIQUE_TBL (t) VALUES ('six');
+QUERY: SELECT '' AS five, * FROM UNIQUE_TBL;
+five|i|t    
+----+-+-----
+    |1|one  
+    |2|two  
+    |1|three
+    |5|one  
+    | |six  
+(5 rows)
+
+QUERY: DROP TABLE UNIQUE_TBL;