# Basic Arithmetic Functions
__*ABS function*__
__*FLOOR function*__
__*SIGN function*__
__*CEILING function*__
__*TRUNCATE function*__
__*ROUND function*__
+ Examples:
```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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