MySQL自訂排序函數FIELD()

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MySQL可以通過field()函數自訂排序，格式：field(value,str1,str2,str3,str4)，value與str1、str2、str3、str4比較，返回1、2、3、4，如遇到null或者不在列表中的資料則返回0.

 

mysql> select * from driver_log order by field(name,‘Suzi‘,‘Ben‘,‘Henry‘);

+--------+-------+------------+-------+

| rec_id | name  | trav_date  | miles |

+--------+-------+------------+-------+

|      2 | Suzi  | 2006-08-29 |   391 |

|      7 | Suzi  | 2006-09-02 |   502 |

|      1 | Ben   | 2006-08-30 |   152 |

|      9 | Ben   | 2006-09-02 |    79 |

|      5 | Ben   | 2006-08-29 |   131 |

|      8 | Henry | 2006-09-01 |   197 |

|      6 | Henry | 2006-08-26 |   115 |

|      4 | Henry | 2006-08-27 |    96 |

|      3 | Henry | 2006-08-29 |   300 |

|     10 | Henry | 2006-08-30 |   203 |

+--------+-------+------------+-------+

MySQL自訂排序函數FIELD()