In the market,vegetables are sold by_ kilogram,I mean,by _ weight.

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ADD TABLE S(CN CHAR(8)) ADD TABLE SALTER(CN CHAR(8)) ALTER TABLE S ADD(CN CHAR(8)) ALTER TABLE S (ADDCN CHAR(8))

DROP TABLE S DELETE TABLE S DELETE TABLE DBF ERASE TABLE S

DaⅥs￠s Tables Burdwood ￠s Tables Azimuth Tables A 和 B"

DROP TABLE S DELETE TABLE S DELETE TABLE S.DBF ERASE TABLE S

delete table s delete s drop table s drop s

AKTER TABLE S DROP COLUMN 年龄 DELETE 年龄 FROM S ALTER TABLE S DELETE COLUMN年龄 ALTER TABLE S DELETE年龄

ALTER TABLE s DELETE c ALTER TABLE s DROP c DELETE TABLE s DELETE c DELETE TABLE s DROP c

ADD TABLE S(NAME CHAR(10)) ADD TABLE S ALTER(NAME CHAR(10)) ALTER TABLE S ADD(NAME CHAR(10)) ALTER TABLE S(ADD NAME CHAR(10))

add table s（CNchar（8）） add table salter（CNchar（8）） alter table sadd（CNchar（8）） alter table s（addCNchar（8））

ALTER TABLE S DROP COLUMN 年龄 DELETE 年龄 FROM S ALTER TABLE S DELETE COLUMN 年龄 ALTER TABLE S DELETE 年龄

ALTER S DROP PHONE ALTER TABLE S DROP PHONE UPDATE TABLE S PHONE DROP TABLE S PHONE

ALTER TABLE S DROP COLUMN 年龄 DELETE 年龄 FROM S ALTER TABLE S DELETE COLUMN 年龄 ALTER TABLE S DELETE 年龄

MODIFY TABLE S ADD City ALTER TABLE S ADD City ALTER TABLE S ADD City CHAR(10) MODIFY TABLE S ADD City CHAR(10)

ALTER TABLE S DROP COLUMN 年龄 DELETE 年龄 FROM S ALTER TABLE S DELETE COLUMN 年龄 ALTER TABLE S DELETE 年龄

ALTER TABLE S DROP COLUMN年龄 DELETE年龄FROM S ALTER TABLE S DELETE COLUMN年龄 ALTER TABLE S DELETE年龄