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Download MySQL 8.0 Database Developer Exam Dumps
NEW QUESTION 37
Examine these MySQL Shell statements:
What is the true about the attempts to add document to the collection?
- A. First two documents are added, then mismatched field names cause a warning.
- B. All documents are added without any error or warning.
- C. First three documents are added, then different number of fields cause an error.
- D. All documents are added and cause a warning.
- E. First two documents are added, then mismatched field names cause an error.
Answer: D
NEW QUESTION 38
Which two are true about indexes?
- A. Indexes reduce disk space used.
- B. Indexing all of a table’s columns improves performance.
- C. Secondary index access will always be faster than a table scan.
- D. Indexes are used to enforce unique constraints.
- E. Indexes contain rows sorted by key values.
Answer: A,B
NEW QUESTION 39
Examine this statement which executes successfully:
The table is populated with a range of values including jobs for Robert, John, and Katie. Now, examine this statement and output:
Why is an empty result set returned?
- A. The JSON datatype cannot be used in virtual columns.
- B. The json_extract() function requires a length value that matches the field length in the schema.
- C. The select requires json_unquoteo in the where clause.
- D. The virtual values in the name column must be accessed using functions.
- E. Table statistics must be updated to generate values for the name column.
Answer: A
NEW QUESTION 40
Examine this statement which has executed successfully:
- A. Execution performance can be improved by, using a composite index with column description as the leftmost prefix column description.
- B. Execution performance can be improved by adding an index on column description.
- C. The statement takes advantage of index description_idx.
- D. Execution performance can be improved by using like instead of RLIKE.
- E. No index will improve statement performance.
Answer: A
NEW QUESTION 41
Examine this bar graph based on columns from the players table:
Which two statements would generate this bar graph?
- A. SELECT Name, Gender, Sport, RPAD (‘# ‘ GPA*10) AS GPA_Graph FROM players ORDER BY GPA DESC;
- B. SELECT Name, Gender, Sport, CHAR_LENGTH (‘# ‘ GPA*10) AS GPA_Graph FROM players ORDER BY GPA DESC;
- C. SELECT Name, Gender, Sport, LENGTH (GPA*10, ‘# ‘) AS GPA_Graph FROM players ORDER BY GPA DESC;
- D. SELECT Name, Gender, Sport, REPEAT(‘# ‘Y GPA*10) AS GPA_Graph FROM players ORDER BY GPA DESC;
- E. SELECT Name, Gender, Sport, CONCAT (‘# ‘ GPA*10) AS GPA_Graph FROM players ORDER BY GPA DESC;
Answer: A,C
NEW QUESTION 42
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