DROP DATABASE IF EXISTS mcs30_db1;
CREATE DATABASE mcs30_db1;
USE mcs30_db1;
CREATE TABLE t1
( c1  INT, c2 CHAR(10), c3 TEXT DEFAULT 'ccc' ) ENGINE=Columnstore;
INSERT INTO t1 (c1, c2) VALUES (1, 'a'), (1, 'b'), (2, 'b');
UPDATE t1 SET c2 = 'b', c3 = 'bbb' WHERE c1 = 2;
SELECT * FROM t1;
c1	c2	c3
1	a	ccc
1	b	ccc
2	b	bbb
INSERT INTO t1 VALUES (NULL, NULL, NULL);
INSERT INTO t1 (c1, c2) VALUES (NULL, NULL);
UPDATE t1 SET c1 = c1+1, c3 = 'bbb' WHERE c2 = 'b';
SELECT * FROM t1;
c1	c2	c3
1	a	ccc
2	b	bbb
3	b	bbb
NULL	NULL	NULL
NULL	NULL	ccc
UPDATE t1 SET c2 = 'd' WHERE c3 IN ('bbb', 'ccc');
SELECT * FROM t1;
c1	c2	c3
1	d	ccc
2	d	bbb
3	d	bbb
NULL	NULL	NULL
NULL	d	ccc
UPDATE t1 SET c2 = 'e', c3 = 'eee' WHERE c1 > 1 AND c3 = 'bbb';
SELECT * FROM t1;
c1	c2	c3
1	d	ccc
2	e	eee
3	e	eee
NULL	NULL	NULL
NULL	d	ccc
UPDATE t1 SET c2 = NULL WHERE c3 = 'ccc';
SELECT * FROM t1;
c1	c2	c3
1	NULL	ccc
2	e	eee
3	e	eee
NULL	NULL	NULL
NULL	NULL	ccc
DROP TABLE t1;
CREATE TABLE t1 (a INT NOT NULL, b INT NOT NULL) ENGINE=Columnstore;
INSERT INTO t1 VALUES (1,1),(1,2),(1,3),(3,1),(3,2),(3,3),(3,1),(3,2),(3,3),(2,1),(2,2),(2,3);
SET @tmp=0;
UPDATE t1 SET b=(@tmp:=@tmp+1);
SELECT * FROM t1 ORDER BY a, b;
a	b
1	1
1	1
1	1
2	1
2	1
2	1
3	1
3	1
3	1
3	1
3	1
3	1
CREATE TABLE t2 (a INT NOT NULL, b INT NOT NULL) ENGINE=Columnstore;
INSERT INTO t2 VALUES (1,1),(1,2),(1,3);
UPDATE t1 SET b=(SELECT 5);
SELECT * FROM t1 ORDER BY a, b;
a	b
1	5
1	5
1	5
2	5
2	5
2	5
3	5
3	5
3	5
3	5
3	5
3	5
UPDATE t1 SET b=(SELECT b FROM t2 ORDER BY b LIMIT 1);
SELECT * FROM t1 ORDER BY a, b;
a	b
1	1
1	1
1	1
2	1
2	1
2	1
3	1
3	1
3	1
3	1
3	1
3	1
SELECT * FROM t2 ORDER BY a, b;
a	b
1	1
1	2
1	3
DROP DATABASE IF EXISTS mcs30_db1;