DROP DATABASE IF EXISTS mcs82_db;
CREATE DATABASE mcs82_db;
USE mcs82_db;
CREATE TABLE t1 (t1_int INT, t1_char CHAR(5))ENGINE=Columnstore;
CREATE TABLE t2 (t2_int INT, t2_char CHAR(5))ENGINE=Columnstore;
INSERT INTO t1 VALUES (NULL, NULL),(1, 'aaa'),(2, 'bbb'),(3, 'ccc'),(4, 'ddd'),(5, 'aa'),(6, ''),(7, 'aaaaa');
INSERT INTO t2 VALUES (NULL, NULL),(1, 'hhhh'),(3, 'iii'),(5, 'jjj'),(6, ''),(7, 'lll'),(9, 'm'),(11, 'nnn');
SELECT * FROM t1 ORDER BY t1_int;
t1_int	t1_char
NULL	NULL
1	aaa
2	bbb
3	ccc
4	ddd
5	aa
6	
7	aaaaa
UPDATE t1 JOIN t2 on t1.t1_int=t2.t2_int SET t1.t1_char='sssss';
SELECT * FROM t1 ORDER BY t1_int;
t1_int	t1_char
NULL	NULL
1	sssss
2	bbb
3	sssss
4	ddd
5	sssss
6	sssss
7	sssss
UPDATE t1 INNER JOIN t2 on t1.t1_int=t2.t2_int SET t1.t1_char='pqrs' WHERE t1_char LIKE '%a%';
SELECT * FROM t1 ORDER BY t1_int;
t1_int	t1_char
NULL	NULL
1	sssss
2	bbb
3	sssss
4	ddd
5	sssss
6	sssss
7	sssss
UPDATE t2 LEFT JOIN t1 on t1.t1_int=t2.t2_int SET t1.t1_char='xyz' WHERE t1_char is NULL;
SELECT * FROM t2 ORDER BY t2_int;
t2_int	t2_char
NULL	NULL
1	hhhh
3	iii
5	jjj
6	
7	lll
9	m
11	nnn
DROP DATABASE mcs82_db;