單項選擇題將表Teacher中職稱字段為"助教"人員改為"講師",應為()

A:UPDATE Teacher SET職稱="助教"WHERE職稱="講師"
B:UPDATE Teacher SET職稱="講師"WHERE職稱="助教"
C:UPDATE SET職稱="助教"WHERE職稱="講師"FROMTeacher
D:UPDATE SET職稱="講師"WHERE職稱="助教"FROMTeacher


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1.單項選擇題刪除表Teacher中編號為070041的記錄,應為()

A:DELETE FROM Teacher WHERE編號="070041"
B:DELETE FROM Teacher 編號="070041"
C:DELETE編號="070041"FROMTeacher
D:DELETE FROM Teacher WHERE編號IS"070041"

2.單項選擇題根據(jù)關(guān)系模型Teacher(編號,職稱)下列SQL語句正確的是()

A:INSERT INTO Teacher(編號,職稱)VALUES("070041","助教")
B:INSERT INTO Teacher("070041","助教")VALUES(編號,職稱)
C:INSERT INTO VALUES(編號,職稱)Teacher("070041","助教")
D:INSERT INTO VALUES("070041","助教")Teacher(編號,職稱

4.單項選擇題假設某數(shù)據(jù)表中有一個"生日"字段,刪除80年出生的學生記錄的語句是()

A:DELETE FROM Student WHERE生日Between #80-01-01#And#80-12-31#
B:DELETE FROM Student WHERE生日Between("80-01-01"And"80-12-31")
C:DELETE FROM Student WHERE生日Between("80.01.01"And"80.12.31")
D:DELETE FROM Student WHERE生日Between #80.01.01#And#80.12.31#

5.單項選擇題在SQL查詢語句中,下列說法正確的是()

A:一個UPDATE命令一次只能對一個表進行修改
B:一個UPDATE命令同時能對多個表進行修改
C:UPDATE命令不能對表進行修改
D:以上說法均不正確