求教informix数据库怎么建unique key
求教informix数据库怎么建unique key我写成这个样子
create table pps_2
(
errortype char(1),
msisdn char(32),
sequence char(20),
tradetime char(14),
UNIQUE KEY (msisdn,sequence,tradetime)
)建表会报错 PRIMARY KEY (msisdn,sequence,tradetime)
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