多項(xiàng)選擇題

Which two statements about creating constraints are true? （）

A. Constraint names must start with SYS_C
B. All constraints must be defines at the column level
C. Constraints can be created after the table is created
D. Constraints can be created at the same time the table is created
E. Information about constraints is found in the VIEW_CONSTRAINTS dictionary view

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單項(xiàng)選擇題

The CUSTOMERS table has these columns:

Which statement finds the rows in the CUSTOMERS table that do not have a postal code?（）

A. SELECT customer_id, customer_name   FROM customers   WHERE postal_code CONTAINS NULL;
B. SELECT customer_id, customer_name   FROM customers   WHERE postal_code = '________';
C. SELECT customer_id, customer_name   FROM customers   WHERE postal_code IS NULL;
D. SELECT customer_id, customer_name   FROM customers   WHERE postal code IS NVL;
E. SELECT customer_id, customer_name   FROM customers   WHERE postal_code = NULL;

單項(xiàng)選擇題

You are granted the CREATE VIEW privilege. What does this allow you to do?（）

A. Create a table view.
B. Create a view in any schema.
C. Create a view in your schema.
D. Create a sequence view in any schema.
E. Create a view that is accessible by everyone.
F. Create a view only of it is based on tables that you created.

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Which two statements about creating constraints are true? （）

你可能感興趣的試題

The CUSTOMERS table has these columns: Which statement finds the rows in the CUSTOMERS table that do not have a postal code?（）

You are granted the CREATE VIEW privilege. What does this allow you to do?（）

The CUSTOMERS table has these columns:

Which statement finds the rows in the CUSTOMERS table that do not have a postal code?（）