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NEW QUESTION # 402
Which two statements are true about substitution variables?
Answer: C,E
Explanation:
Substitution variables in Oracle are used to replace a value dynamically during the execution of SQL statements. The behavior of these variables is well-documented:
* C. A substitution variable prefixed with & always prompts only once for a value in a session: This is true. In a session, when you use a single ampersand (&), SQL*Plus or SQL Developer will prompt for the value the first time the variable is encountered. The value for this variable will then be reused for the remainder of the session unless it is redefined.
* D. A substitution variable can be used with any clause in a SELECT statement: Substitution variables can be placed in any part of a SQL statement, including the SELECT, WHERE, GROUP BY, ORDER BY, etc. They are not limited to any specific clause.
References:
* Oracle SQL*Plus User's Guide and Reference, which discusses substitution variables.
NEW QUESTION # 403
Examine the description of the CUSTONERS table
CUSTON is the PRIMARY KEY.
You must derermine if any customers'derails have entered more than once using a different costno,by listing duplicate name Which two methode can you use to get the requlred resuit?
Answer: B,E
Explanation:
To determine if customer details have been entered more than once using a different custno, the following methods can be used:
SUBQUERY: A subquery can be used to find duplicate names by grouping the names and having a count greater than one.
SELECT custname FROM customers GROUP BY custname HAVING COUNT(custname) > 1; Self Join: A self join can compare rows within the same table to find duplicates in the custname column, excluding matches with the same custno.
SELECT c1.custname FROM customers c1 JOIN customers c2 ON c1.custname = c2.custname AND c1.custno != c2.custno; These methods allow us to find duplicates in the custname column regardless of the custno. Options A, B, and E are not applicable methods for finding duplicates in this context.
Reference:
Oracle Documentation on Group By: Group By
Oracle Documentation on Joins: Joins
NEW QUESTION # 404
Examine the description of the EMPLOYEES table:
Which statement will fail?
Answer: C
NEW QUESTION # 405
View the exhibit and examine the structure of the SALES, CUSTOMERS, PRODUCTSand TIMEStables.
The PROD_IDcolumn is the foreign key in the SALEStable, which references the PRODUCTStable.
Similarly, the CUST_IDand TIME_IDcolumns are also foreign keys in the SALEStable referencing the CUSTOMERSand TIMEStables, respectively.
Evaluate the following CREATE TABLEcommand:
CREATE TABLE new_sales (prod_id, cust_id, order_date DEFAULT SYSDATE)
AS
SELECT prod_id, cust_id, time_id
FROM sales;
Which statement is true regarding the above command?
Answer: B
NEW QUESTION # 406
Examine the description of the SALES1 table:
SALES2 is a table with the same description as SALES1,
Some sales data is duplicated In both tables.
You want to display the rows from the SALES1 table which are not present in the SALIES2 table.
Which set operator generates the required output?
Answer: A
NEW QUESTION # 407
......
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