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                [TOC] | 函數 | 用途 | | -- | -- | | round | 四舍五入 | | ceil | 向上取整 ,返回 >= 該參數的最小整數 | | floor | 向下取整,返回 <= 改參數的最大整數 | | truncate | 截斷,就是保留幾位小數 | <br> <br> >[success] ## 一:round 四舍五入 ```sql select ROUND(5.66234) -- 結果:6 SELECT ROUND(-1,5.3) -- 結果:-1 SELECT ROUND(1.567,2)) -- 結果:1.57 ``` <br> <br> >[success] ## 二:ceil 向上取正 ```sql SELECT CEIL(1.0003) -- 結果:2 ``` <br> <br> >[success] ## 三:floor 向下取整 ```sql SELECT FLOOR(9.99) -- 結果:9 ``` <br> <br> >[success] ## 四:truncate 截斷 ```sql SELECT truncate(9.99,1) -- 結果:9.99 ``` <br> <br> >[success] ## 五:mod 取余 ```sql SELECT MOD(10,3) 結果:1 ```
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