1z0-882 무료 덤프문제 온라인 액세스

A table (t1) contains 1000 random integer values in the first column (col1). The random values range from 1 to 1000.
You execute this query:
SELECT col1 FROM t1 WHERE col1< 100
UNION
SELECT col1 FROM t1 WHERE col1 BETWEEN 100 and 200
UNION ALL
SELECT col1 FROM t1 WHERE col 1 >=900
What is the output?

• A.A list of unique values within the range of 1-200 and a list of all values, including duplicates, on the table within the
  range of 900-1000
• B.A list of all values , including duplicates, in the range of 1-200 and a list of unique values in the range of 900-1000
• C.An error, because mixing UNION and UNION ALL in the same query is not permitted
• D.A list of unique values within the ranges of 1-200 and 900-1000
• E.A list of all values, including duplicates, in the ranges of 1-200 and 900-1000

You have two lists of values to correlate.

Which query lists all names in colors1 and how many total matches are there in colors2?

• A.SELECT colors1. Name count (colors2.name)
  FROM colors1
  INNER JOIN colors2
  on colors1. Name =colors2. Name
  GROUP BY colors1 .name;
• B.SELECT colors1.name, count(colorse2. Name)
  FROM colorse1 .name =colors2.name
  WHERE colors1. Name =colors2.name
  GROUP BY colors1.name,
• C.SELECT colors1.name, count (colors2.name)
  FROM JOIN colors2
  on colors1 .name =colors2.name
  GROUP BY colors1.name;
  SELECT colors1.name, count (colors2.name)
  FROM colors1
  RIGHT JOIN colors1
  on colors1 .name =colors2.name
  GROUP BY colors1.name;
• D.SELECT colors1 .name.count (colors2.name)
  FROM colors1. Colors2
  WHERE
  Colors1. Name = (SELECT DISTINCT name FROM colors2 WHERE colors1.name=colors2.name)
  GROUP BY colorse1.name,

The city table has the following structure:

Consider the statement with an incorrect field name:
PREPARE countryBYID FROM 'SELECT country FROM city WHERE ID=?,
What happens if a prepared statement named countryByID already exists when the above statement is executed?

• A.An unknown column error will result and the old prepared statement definition will remain in effect.
• B.A duplicate name error will result because a prepared statement with the same name already exists.
• C.An unknown column error will result and no prepared statement named countryByID will exist.
• D.A warning will result and the old prepared statement definition will remain in effect.

What are two ways in which normalizing your tables helps improve performance In MySQL?

• A.Fewer nullable column improve index usage.
• B.Separate tables allow indexing more columns.
• C.Smaller table sizes and row lengths improve sorting operations.
• D.Normalizing Improves the performance of innodb_file_per _table.

Which three view types are not updateable?

• A.A view containing a WHERE clause
• B.A view containing a GROUP BY clause
• C.A view that contains a literal column
• D.A view created with the TEMPTABLE algorithm
• E.A view containing a HAVING clause