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NEW QUESTION # 108
Which two true about a sql statement using SET operations such as UNION?
Answer: C,D
Explanation:
In the context of SQL statements using SET operations like UNION in Oracle Database 12c:
* A. The data type of each column returned by the second query must be implicitly convertible to
* the data type of the corresponding column returned by the first query. This is correct. Oracle allows the union of columns as long as their data types are implicitly convertible, not necessarily identical.
* C. The number, but not names, of columns must be identical for all SELECT statements in the query. This is correct. For a UNION operation to be valid, all SELECT statements involved must have the same number of columns, although their names and exact data types need not match.
Options B, D, and E are incorrect:
* B is incorrect because exact data type matches are not required, only that they be implicitly convertible.
* D is also incorrect for the same reason as B; it's enough that the types are compatible, not identical.
* E is incorrect as the names
NEW QUESTION # 109
Examine the structure of the EMPLOYEES table.
You must display the details of employees who have manager with MANAGER_ID 100, who were hired in the past 6 months and who have salaries greater than 10000.
Which query would retrieve the required result?
Answer: C
NEW QUESTION # 110
Examine this SELECT statement and view the Exhibit to see its output: (Choose two.)
SELECT constraints_name, constraints_type, search_condition, r_constraints_name, delete_rule, status, FROM user_constraints WHERE table_name = 'ORDERS'; Which two statements are true about the output?
Answer: C,D
NEW QUESTION # 111
The STORES table has a column START_ DATE of data type DATE, containing the date the row was inserted.
You only want to display details of rows where START_ DATE is within the last 25 months.
Which WHERE clause can be used?
Answer: A
Explanation:
When you need to compare dates and calculate the difference in months between two dates, you use the MONTHS_BETWEEN function in Oracle SQL.
A). This statement is incorrect because MONTHS_BETWEEN takes the later date first, then the earlier date.
B). This statement is correct. The MONTHS_BETWEEN function returns the number of months between two dates. It takes the later date (in this case, SYSDATE) first and the earlier date (start_date) second. If the start_date is within the last 25 months, the result will be less than or equal to 25.
C). This statement is incorrect. The expression TO_NUMBER(start_date - SYSDATE) would not give the correct number of months between the dates.
D). This statement is incorrect. The ADD_MONTHS(start_date, 25) function adds 25 months to start_date, and comparing it to SYSDATE would show dates that are at least 25 months in the future.
NEW QUESTION # 112
Evaluate the following SQL statement:
Which statement is true regarding the outcome of the above query?
Answer: A
NEW QUESTION # 113
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