党的十五大报告指出，加强党的思想建设，根本的是（）。A．解放思想，实事求是B．讲学习，讲政治，讲正气C．

A. 0

B. 1

C. 0.00

D. An error statement

Evaluate this SQL statement:SELECT e.employee_id, (.15* e.salary) + (.5 * e.commission_pct) + (s.sales amount * (.35 * e.bonus)) AS CALC_VALUEFROM employees e, sales sWHERE e.employee_id = s.emp_id;What will happen if you remove all the parentheses from the calculation？ （）

A. The value displayed in the CALC_VALUE column will be lower.

B. The value displayed in the CALC_VALUE column will be higher.

C. There will be no difference in the value displayed in the CALC_VALUE column.

D. An error will be reported.

Evaluate this SQL statement:e.employee_id, (.15* e.salary) + (.5 * e.commission_pct)+ (s.sales_amount * (.35 * e.bonus)) AS CALC_VALUEFROM employees e, sales sWHERE e.employee_id = s.emp_id;What will happen if you remove all the parentheses from the calculation？（）

A.The value displayed in the CALC_VALUE column will be lower.

B.The value displayed in the CALC_VALUE column will be higher.

C.There will be no difference in the value displayed in the CALC_VALUE column.

D.An error will be reported.

A.

B.

C.

D.

E. The SQL statement produces an error.

A. 0

B. 1

C. 0.00

D. An error statement

A．

B．

C．

D．

A. 17000.00

B. 17000*****

C. ****170.00

D. **17000.00

E. an error statement

A. The DESCRIBE DEPT statement displays the structure of the DEPT table.

B. The ROLLBACK statement frees the storage space occupies by the DEPT table.

C. The DESCRIBE DEPT statement returns an error ORA-04043: object DEPT does not exist.

D. The DESCRIBE DEPT statement displays the structure of the DEPT table only if there is a COMMIT statement introduced before the ROLLBACK statement.

A. It executes successfully but partition pruning cannot happen for this partition key.

B. It produces an error because the TOTAL_VALUE column cannot be used as a partition key.

C. It produces an error because compression cannot be used for the TOTAL_VALUE partition key.

D. It executes successfully but the values in the TOTAL_VALUE column would not be physically stored in the partitions.

A．Selection, projection, join

B． Difference, projection, join

C． Selection, intersection, join

D． Intersection, projection, join

E． Difference, projection, product