# 基本算数函数

__*ABS 函数*__
__*FLOOR 函数*__
__*SIGN 函数*__
__*CEILING 函数*__
__*TRUNCATE 函数*__
__*ROUND 函数*__

+ 示例:
```10
tidb> SELECT 
   -> abs(-234.5),sign(-6),
   -> floor(343.4543),ceiling(2343.34),
   -> truncate(343.4543,3),truncate(343.4543,-1),
   -> round(343.4543),round(343.4543,2),round(343.4543,-2)\G
*************************** 1. row ***************************
          ~!@abs@!~(-234.5): 234.5
             ~!@sign@!~(-6): -1
      ~!@floor@!~(343.4543): 343
     ~!@ceiling@!~(2343.34): 2344
 ~!@truncate@!~(343.4543,3): 343.454
~!@truncate@!~(343.4543,-1): 340
      ~!@round@!~(343.4543): 343
    ~!@round@!~(343.4543,2): 343.45
   ~!@round@!~(343.4543,-2): 300
```
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