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mysql SIGN(x) 判断数字x是正数负数还是零

WBOY
WBOYOriginal
2016-06-01 09:56:495307browse

mysql SIGN(x)符号函数,根据数值返回1(正数) 0(零) -1(负数).

下面用一个实例来说明SIGN()符号函数的使用方法：

<code class="language-sql">mysql> SELECT SIGN(-32); 
      -1

mysql> SELECT SIGN(0); 
      0

mysql> SELECT SIGN(234); 
      1</code>

即：如果x是正数，则返回1，如果x是负数，则返回-1，如果x是0，则返回0。

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