MySQLsign()函数

SIGN(X)

这个函数返回X的符号(负数，零或正)对应-1，0或1。

mysql>SELECT SIGN(-4.65);
+---------------------------------------------------------+
| SIGN(-4.65)                                             |
+---------------------------------------------------------+
| -1                                                      |
+---------------------------------------------------------+
1 row in set (0.00 sec)

mysql>SELECT SIGN(0);
+---------------------------------------------------------+
| SIGN(0)                                                 |
+---------------------------------------------------------+
| 0                                                       |
+---------------------------------------------------------+
1 row in set (0.00 sec)

mysql>SELECT SIGN(4.65);
+---------------------------------------------------------+
| SIGN(4.65)                                              |
+---------------------------------------------------------+
| 1                                                       |
+---------------------------------------------------------+
1 row in set (0.00 sec)

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