A.select staffno from staff where E_mail＝NULL B.select staffno from staff where E_mail NULL C.select staffno from staff where E_mail is NULL D.select staffno from staff where E_mail is not NULL
A.SELECT price FROM book WHERE book_name＝“數(shù)據(jù)庫*” B.SELECT price FROM book WHERE book_name LIKE“數(shù)據(jù)庫*” C.SELECT price FROM book WHERE book_name＝“數(shù)據(jù)庫%” D.SELECT price FROM book WHERE book_name LIKE“數(shù)據(jù)庫%”
A.DROP SCHEMA B.CREATE TABLE C.DROP VIEW D.DROP INDEX
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