1Z0-007章節(jié)練習(xí)(2019.11.06)

A.
B.
C.
D.
E.

A. Both tables have NULL values.
B. You want all unmatched data from one table.
C. You want all matched data from both tables.
D. You want all unmatched data from both tables.
E. One of the tables has more data than the other.
F. You want all matched and unmatched data from only one table.

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 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 an INSERT statement to insert multiple rows at a time.

A. 0
B. 1
C. 0.00
D. An error statement

A. UPDATE employees SET first_name = 'John' SET last_name = 'Smith' WHERE employee_id = 180;
B. UPDATE employees SET first_name = 'John', SET last_name = 'Smoth' WHERE employee_id = 180;
C. UPDATE employee SET first_name = 'John' AND last_name = 'Smith' WHERE employee_id = 180;
D. UPDATE employee SET first_name = 'John', last_name = 'Smith' WHERE employee_id = 180;

A. SELECT &1, "&2" FROM &3 WHERE last_name = '&8';
B. SELECT &1, '&2' FROM &3 WHERE '& last_name = '&8';
C. SELECT &1, &2 FROM &3 WHERE last_name = '&8';
D. SELECT &1, '&2' FROM EMP WHERE last_name = '&8';

A. An error is returned.
B. You are prompted to enter a new value.
C. A report is produced that matches the first report produced.
D. You are asked whether you want a new value or if you want to run the report based on the previous value.

A. Binary data up to 4 gigabytes.
B. Character data up to 4 gigabytes.
C. Raw binary data of variable length up to 2 gigabytes.
D. Binary data stored in an external file, up to 4 gigabytes.
E. A hexadecimal string representing the unique address of a row in its table.

A. MAX
B. MIN
C. SUM
D. COUNT
E. TOTAL
F. LARGEST

A. MERGE
B. INSERT
C. UPDATE
D. ADD
E. ENTER
F. You cannot enter the phone numbers for the existing employee records.