Discuz upgrade to Database Error:pre_common_syscache ADD PRIMARY KEY (CNAME) "Workaround"

Error code: 1068
Multiple primary key defined

Execution time:00:00:00:000
Transfer time:00:00:00:000
Total time:00:00:00:000

Workaround:
DROP TABLE IF EXISTS Pre_common_syscache;
CREATE TABLE Pre_common_syscache (
CNAME varchar (+) not NULL,
CType tinyint (3) unsigned not NULL,
Dateline Int (ten) unsigned not NULL,
' Data ' Mediumblob not NULL,
PRIMARY KEY (CNAME)
) Type=myisam;
Re-run the upgrade program.

Discuz upgrade to Database Error:pre_common_syscache ADD PRIMARY KEY (CNAME) "Workaround"