OCP 1Z0 051 QUESTION NO: 34

QUESTION NO: 34

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

与正式题库108重复

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