DROP DATABASE IF EXISTS mcs225_db;
CREATE DATABASE mcs225_db;
USE mcs225_db;
CREATE TABLE t1 (a INT, b CHAR(20))ENGINE=Columnstore;
INSERT INTO t1 VALUES (NULL, NULL),(1, 'aaa'),(2, 'abcabc'),(3, 'cccbba'),(4, 'dddd'),(5, 'pqrs');
SELECT REPLACE('abbcccb', 'b', 'z');
REPLACE('abbcccb', 'b', 'z')
azzcccz
SELECT REPLACE('xyz', 'z', 'ppp');
REPLACE('xyz', 'z', 'ppp')
xyppp
SELECT b, REPLACE(b, 'a', 'mcs') FROM t1 ORDER BY 1;
b	REPLACE(b, 'a', 'mcs')
NULL	NULL
aaa	mcsmcsmcs
abcabc	mcsbcmcsbc
cccbba	cccbbmcs
dddd	dddd
pqrs	pqrs
SELECT b, REPLACE(b, 'b', 'oo') FROM t1 ORDER BY 1;
b	REPLACE(b, 'b', 'oo')
NULL	NULL
aaa	aaa
abcabc	aoocaooc
cccbba	cccooooa
dddd	dddd
pqrs	pqrs
SELECT b, REPLACE(b, 'pqrs', 'a') FROM t1 ORDER BY 1;
b	REPLACE(b, 'pqrs', 'a')
NULL	NULL
aaa	aaa
abcabc	abcabc
cccbba	cccbba
dddd	dddd
pqrs	a
SELECT b, REPLACE(b, 'dd', 'n') FROM t1 ORDER BY 1;
b	REPLACE(b, 'dd', 'n')
NULL	NULL
aaa	aaa
abcabc	abcabc
cccbba	cccbba
dddd	nn
pqrs	pqrs
DROP DATABASE mcs225_db;