单选题You need to change the definition of an existing table. The COMMERCIALS table needs its DESCRIPTION column changed to hold varying length characters up to 2000 bytes. The column can currently hold 1000 bytes per value. The table contains 20000 rows. Which statement is valid?（）AALTER TABLE commercials MODIFY (description CHAR2(2000));BALTER TABLE commercials CHANGE (description CHAR2(2000));CALTER TABLE commercials CHANGE (description VARCHAR2 (2000));DALTER TABLE commercials MODIFY (description VARCHAR2 (2000));EYou cannot increase the size of a column if the table has rows.
单选题
You need to change the definition of an existing table. The COMMERCIALS table needs its DESCRIPTION column changed to hold varying length characters up to 2000 bytes. The column can currently hold 1000 bytes per value. The table contains 20000 rows. Which statement is valid?（）
A
ALTER TABLE commercials MODIFY (description CHAR2(2000));
B
ALTER TABLE commercials CHANGE (description CHAR2(2000));
C
ALTER TABLE commercials CHANGE (description VARCHAR2 (2000));
D
ALTER TABLE commercials MODIFY (description VARCHAR2 (2000));
E
You cannot increase the size of a column if the table has rows.
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