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Which two statements are true about sequences created in a single instance database? (Choose two.) A. CURRVAL is used to refer to the last sequence number that has been generated B. DELETE would remove a sequence from the database C. The numbers generated by a sequence can be used only for one table D. When the MAXVALUE limit for a sequence is reached, you can increase the MAXVALUE limit by using the ALTER SEQUENCE statement E. When a database instance shuts down abnormally, the sequence numbers that have been cached but not used would be available once again when the database instance is restarted Answer: A,D
Evaluate the following two queries: Which statement is true regarding the above two queries? A. Performance would improve query 2 only if there are null values in the CUST__CREDIT__LIMIT column. B. There would be no change in performance. C. Performance would degrade in query 2. D. Performance would improve in query 2. Answer: B
Which two tasks can be performed by using Oracle SQL statements? A. changing the password for an existing database B. connecting to a database instance C. querying data from tables across databases D. starting up a database instance E. executing operating system (OS) commands in a session Answer: C,E
Which two statements are true regarding the COUNT function? (Choose two.) A. COUNT(*) returns the number of rows including duplicate rows and rows containing NULL value in any of the columns B. COUNT(cust_id) returns the number of rows including rows with duplicate customer IDs and NULL value in the CUST_ID column C. COUNT(DISTINCT inv_amt) returns the number of rows excluding rows containing duplicates and NULL values in the INV_AMT column D. A SELECT statement using COUNT function with a DISTINCT keyword cannot have a WHERE clause E. The COUNT function can be used only for CHAR, VARCHAR2 and NUMBER data types Answer: A,C
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