78.Evaluate the following query:
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78.Evaluate the following query:
SQL> SELECT TRUNC(ROUND(156.00,-1),-1) FROM DUAL;
What would be the outcome?
A.16
B.100
C.160
D.200
E.150
答案：C
解析：round，trunc正数是小数点右边，负数是小数点左边，因此
round(156.00.-1) 结果是160，trunc(160.00,-1)还是160
SQL> SELECT TRUNC(ROUND(156.00,-1),-1) FROM DUAL;
What would be the outcome?
A.16
B.100
C.160
D.200
E.150
答案：C
解析：round，trunc正数是小数点右边，负数是小数点左边，因此
round(156.00.-1) 结果是160，trunc(160.00,-1)还是160
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