通过 SQL返回 "Actor" 表中记录的数目的表述正确的是（）。? SELECT COUNT() FROM Actor|SELECT COUNT(*) FROM Actor|SELECT COLUMNS(*) FROM Actor|SELECT COLUMNS() FROM Actor
举一反三
- 通过 SQL返回 "Actor" 表中记录的数目的表述正确的是（）。 A: SELECT COLUMNS() FROM Actor B: SELECT COLUMNS(*) FROM Actor C: SELECT COUNT() FROM Actor D: SELECT COUNT(*) FROM Actor
- 通过 SQL返回 "Actor" 表中记录的数目的表述正确的是（）。 A: SELECT COUNT(*) FROM Actor B: SELECT COLUMNS(*) FROM Actor C: SELECT COLUMNS() FROM Actor D: SELECT COUNT() FROM Actor
- 通过 SQL，根据 "FirstName" 列降序地从 "Actor" 表返回所有记录的正确表述是（）。 A: SELECT * FROM Actor SORT 'FirstName' DESC B: SELECT * FROM Actor ORDER BY FirstName DESC C: SELECT * FROM Actor ORDER FirstName DESC D: SELECT * FROM Actor SORT BY 'FirstName' DESC
- 从 "actor" 表中选取 "FirstName" 列的SQL语句是（ ）。 A: select actor.FirstName B: extract FirstName from actor C: select FirstName from actor D: update FirstName from actor
- 通过 SQL，从 “actor” 表中选取 "FirstName" 列的值等于"John" 的所有记录的表述正确的是（ ）。? SELECT * FROM Actor WHERE FirstName='John'|SELECT * FROM Actor WHERE FirstName LIKE 'John'|SELECT [all] FROM Actor WHERE FirstName='John'|SELECT [all] FROM Actor WHERE FirstName LIKE 'John'