Which two are true regarding external tables？ （）
A: AExternal tables can be updated.
B: BExternal tables are read-only tables.
C: CIndexes can be created on external tables.
D: DIndexes cannot be created on external tables.
A: AExternal tables can be updated.
B: BExternal tables are read-only tables.
C: CIndexes can be created on external tables.
D: DIndexes cannot be created on external tables.
举一反三
- Titles of tables should be written below the tables.
- Which describes the default behavior when you create a table? () A. The table is accessible to all users. B. Tables are created in the public schema. C. Tables are created in your schema. D. Tables are created in the DBA schema. E. You must specify the schema when the table is created.
- Tables can also be used ____________________.
- Mike and Sandy are two woodworkers who both make tables and chairs. In one month, Mike can make 4 tables or 20 chairs, where Sandy can make 6 tables or 18 chairs. Given this, we know that the opportunity cost of 1 chair is
- Sean got a job of at a fast-food restaurant. A: wait for tables B: waiting for tables C: waiting tables D: /