我希望把一個元組約束在下面的代碼,當FASE是「E」,SP必須至少有2元組約束
Create table MODULE
(
code varchar2(6),
omschr varchar2(25),
fase varchar2(1) CHECK(fase='P' OR fase='K' OR fase='E'),
docent varchar2(3),
sp number(1),
PRIMARY KEY (code)
);
嘗試'alter table module add constraint fase_e_sp_must_be_2_or_more check(fase <>'E'或sp> = 2)' – krokodilko