答案:B
答案:B
A. select seq.ROWNUM from dual;
B. select seq.ROWID from dual;
C. select seq.CURRVAL from dual;
D. select seq.NEXTVAL from dual;
A. 4
B. 8
C. 16
D. 32
A. Hello
B. Keep-alive
C. SPF
D. LSU
A. 一类
B. 二类
C. 三类
D. 四类
A. DATE()
B. current_timestamp()
C. current_date()
D. DBTIMEZONE
A. SELECT NAME + '''s address is ' + ADDR FROM EMP
B. SELECT NAME || '''s address is '|| ADDR FROM EMP
C. SELECT NAME + '\’s address is '+ ADDR FROM EMP
D. SELECT NAME || '\'s address is '|| ADDR FROM EMP
A. ②③⑤④①
B. ③⑤②④①
C. ⑤③④②①
D. ②③①⑤④