DROP TABLE IF EXISTS t1;
CREATE TABLE t1(c1 CHAR(10) NOT NULL PRIMARY KEY);
INSERT INTO t1 (c1) VALUES('abc');
INSERT INTO t1 (c1) VALUES('def');
INSERT INTO t1 (c1) VALUES('abc') ON DUPLICATE KEY UPDATE c1='abcdefg';
SELECT * FROM t1;
c1
abcdefg
def
DROP TABLE t1;
CREATE TABLE t1(c1 VARCHAR(10) NOT NULL PRIMARY KEY);
INSERT INTO t1 (c1) VALUES('abc');
INSERT INTO t1 (c1) VALUES('def');
INSERT INTO t1 (c1) VALUES('abc') ON DUPLICATE KEY UPDATE c1='abcdefg';
SELECT * FROM t1;
c1
abcdefg
def
DROP TABLE t1;
CREATE TABLE t1(c1 BINARY(10) NOT NULL PRIMARY KEY);
INSERT INTO t1 (c1) VALUES('abc');
INSERT INTO t1 (c1) VALUES('def');
INSERT INTO t1 (c1) VALUES('abc') ON DUPLICATE KEY UPDATE c1='abcdefg';
SELECT * FROM t1;
c1
abcdefg   
def       
DROP TABLE t1;
CREATE TABLE t1(c1 VARBINARY(10) NOT NULL PRIMARY KEY);
INSERT INTO t1 (c1) VALUES('abc');
INSERT INTO t1 (c1) VALUES('def');
INSERT INTO t1 (c1) VALUES('abc') ON DUPLICATE KEY UPDATE c1='abcdefg';
SELECT * FROM t1;
c1
abcdefg
def
DROP TABLE t1;