通过 SQL，您如何从 "Persons" 表中选取 "FirstName" 列？
A: SELECT Persons.FirstName
B: SELECT FirstName FROM Persons
C: EXTRACT FirstName FROM Persons
A: SELECT Persons.FirstName
B: SELECT FirstName FROM Persons
C: EXTRACT FirstName FROM Persons
举一反三
- 通过 SQL，您如何从 "Persons" 表中选取 "FirstName" 列的值以 "a" 开头的所有记录？ A: SELECT * FROM Persons WHERE FirstName LIKE 'a%' B: SELECT * FROM Persons WHERE FirstName='a' C: SELECT * FROM Persons WHERE FirstName LIKE '%a' D: SELECT * FROM Persons WHERE FirstName='%a%'
- 通过 SQL，您如何根据 "FirstName" 列降序地从 "Persons" 表返回所有记录？ A: SELECT * FROM Persons SORT 'FirstName' DESC B: SELECT * FROM Persons ORDER BY FirstName DESC C: SELECT * FROM Persons ORDER FirstName DESC D: SELECT * FROM Persons SORT BY 'FirstName' DESC
- 通过 SQL，您如何从 "Persons" 表中选取 "FirstName" 列的值等于"Peter" 的所有记录？ A: SELECT [all] FROM Persons WHERE FirstName='Peter' B: SELECT * FROM Persons WHERE FirstName LIKE 'Peter' C: SELECT [all] FROM Persons WHERE FirstName LIKE 'Peter' D: SELECT * FROM Persons WHERE FirstName='Peter'
- 通过 SQL，您如何在表 Persons 中选择 FirstName 等于 Thomas ，并 且LastName 等于 Carter 的所有记录？ A: SELECT * FROM Persons WHERE FirstName LIKE 'Thomas' AND LastName LIKE 'Carter' B: SELECT FirstName='Thomas', LastName='Carter' FROM Persons C: SELECT * FROM Persons WHERE FirstName='Thomas' AND LastName='Carter'
- 通过 SQL，您如何在 "Persons" 表中删除 "FirstName" 等于 "Fred" 的纪录？ A: DELETE FROM Persons WHERE FirstName = 'Fred' B: DELETE FirstName='Fred' FROM Persons C: DELETE ROW FirstName='Fred' FROM Persons