Evaluate the SQL statement: SELECT ROUND(TRUNC(MOD(1600,10),-1),2) FROM dual; What will be displayed?
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0
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1
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0.00
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An error statement
To evaluate the SQL statement, we need to understand the functions ROUND, TRUNC and MOD.
ROUND: rounds a number to a specified number of decimal places. If the second argument is negative, it rounds to the left of the decimal point. For example, ROUND(123.456, 2) = 123.46, ROUND(123.456, -1) = 120. TRUNC: truncates a number to a specified number of decimal places. If the second argument is negative, it truncates to the left of the decimal point. For example, TRUNC(123.456, 2) = 123.45, TRUNC(123.456, -1) = 120. MOD: returns the remainder of a division operation. For example, MOD(7, 3) = 1, MOD(1600, 10) = 0. Using these functions, we can evaluate the SQL statement step by step:
MOD(1600,10) returns 0, since there is no remainder when dividing 1600 by 10. TRUNC(0,-1) returns 0, since there is nothing to truncate to the left of the decimal point. ROUND(0,2) returns 0, since there is nothing to round to the right of the decimal point. Therefore, the final result displayed by the SQL statement is 0.
Evaluate from the inside out: MOD(1600,10) computes the remainder of 1600 divided by 10, which is 0 (1600 divides evenly by 10). TRUNC(0,-1) truncates 0 to the nearest 10, which is still 0 — truncating zero at any precision remains zero. ROUND(0,2) rounds 0 to 2 decimal places, which is still 0 (displayed as just 0, not 0.00, since Oracle's ROUND on an integer-valued NUMBER doesn't force decimal padding in default display). So the result is 0, matching option "0". "1" is wrong (miscalculating MOD), "0.00" implies formatting Oracle doesn't apply by default here, and there's no error since all functions receive valid numeric arguments.