Oracle数据库考虑下列声明，那些是不合法的：
A.DECLAREv_name,v_deptVARCHAR2(14);
B.DECLAREv_testNUMBER(5);
C.DECLAREV_MAXSALARYNUMBER(7,2)=5000;
D.DECLAREV_JOINDATEBOOLEAN:=SYSDATE;
正确答案是ACD