Trunc

常見例句

• Trunc: Truncates a real number to an integer.
  實(shí)數(shù)截尾爲(wèi)整型數(shù)，肯定會存在誤差的。
• When we specify a format as an input to the ROUND and TRUNC functions, things become a bit more involved, but the concepts of rounding and truncating still remain the same.
  因爲(wèi)時(shí)間已經(jīng)超過中午的12點(diǎn)，距離第二天的時(shí)間比距離儅天起始時(shí)間要近，所以Round函數(shù)返廻第二天的起始時(shí)間，但是Trunc函數(shù)依然返廻輸入時(shí)間的起始部分，這一點(diǎn)和對小數(shù)進(jìn)行四捨五入和截取相似。
• SELECT TRUNC(7.7788,2) FROM DUAL; 249. COUNT
  計(jì)算滿足條件的記錄數(shù).
• ofstream ofile("D:\\v.txt", ios_base::binaryios_base::trunc);
  我需要的是二進(jìn)制的不是這種明文的！
• select firstnme,trunc(salary/30,0) as "日薪金" from employee ;
  顯示在一個(gè)月爲(wèi)30天的情況所有員工的日薪金;忽略餘數(shù).
• ALTER SNAPSHOT SCADA_DATASN REFRESH FAST START WITH trunc(SYSDATE)+22/24 NEXT (SYSDATE)+1/2;
  我在數(shù)據(jù)庫裡建了12個(gè)快照，刷新方式均爲(wèi)FAST，刷新時(shí)間我如下設(shè)制，
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