假设市场利率保持不变，溢价发行债券的价值会随时间的延续而逐渐下降。（)A．正确B．错误

A. A single row subquery can retrieve data from only one table.

B. A SQL query statement cannot display data from table B that is referred to in its subquery, unless table B is included in the main query‘s FROM clause.

C. A SQL query statement can display data from table B that is referred to in its subquery, without including table B in its own FROM clause.

D. A single row subquery can retrieve data from more than one table.

E. A single row subquery cannot be used in a condition where the LIKE operator is used for comparison.

F. A multiple-row subquery cannot be used in a condition where the LIKE operator is used for comparison.

Which of the following words can be used to connect two clauses in a complex sentence？

A．So.

B．Therefore.

C．But.

D．Though.

Which of the following words can be used to connect two clauses in a coordinate sentence？

A．Through.

B．When.

C．But.

D．If.

A、modal verbs such as “may”

B、lexical verbs such as “seem”

C、adverbs such as “possibly”

D、that clauses

A.A WHERE clause can be used to restrict both rows and groups.

B.A WHERE clause can be used to restrict rows only.

C.A HAVING clause can be used to restrict both rows and groups.

D.A HAVING clause can be used to restrict groups only.

E.A WHERE clause CANNOT be used in a query if the query uses a HAVING clause.

F.A HAVING clause CANNOT be used in subqueries.

A. a schema object

B. a subquery that can contain an ORDER BY clause

C. another name for a view that contains group functions

D. a subquery that is part of the FROM clause of another query

Which of the following words can connect two clauses in a coordinate sentence？

A．Through.

B．When.

C．But.

D．If.