如何在现有的mysql表中进行分区？

Question

我有一个名为 tbl_rtdata 的表。我删除了该表中的所有分区，并按以下方式创建了新分区。

ALTER TABLE tbl_rtdata  PARTITION BY RANGE (Month(fld_date))

SUBPARTITION BY HASH (Day(fld_date)) SUBPARTITIONS 12(   
PARTITION Apr_0 VALUES LESS THAN (2012-05-01),
PARTITION May_1 VALUES LESS THAN (2012-06-01),    
PARTITION Jun_2 VALUES LESS THAN (2012-07-01),  
PARTITION Jul_3 VALUES LESS THAN (2012-08-01),
PARTITION Aug_4 VALUES LESS THAN (2012-09-01),
PARTITION Sep_5 VALUES LESS THAN (2012-10-01),
PARTITION Oct_6 VALUES LESS THAN (2012-11-01),  
PARTITION Nov_7 VALUES LESS THAN (2012-12-01),
PARTITION Dec_8 VALUES LESS THAN MAXVALUE );

但是我得到了一个错误： VALUES LESS THAN value must be strictly increasing for each partition.

如果我在查询中删除子分区，它会显示分区 'Apr_0' 的错误 VALUES 值必须具有 INT 类型

我应该怎么做才能从中恢复？

Answer 1

我认为MySQL < 5.5 不支持它 试试这个：手动here

ALTER TABLE tbl_rtdata PARTITION BY RANGE COLUMNS (fld_date) (
  PARTITION Apr_0 VALUES LESS THAN ('2012-05-01'),
  PARTITION May_1 VALUES LESS THAN ('2012-06-01'),
  PARTITION Dec_8 VALUES LESS THAN (MAXVALUE)
  );

Answer 2

我找到了很简单的答案，使用 to_days 函数

ALTER TABLE tbl_rtdata  PARTITION BY RANGE (Month(fld_date))
(   
PARTITION p_Apr VALUES LESS THAN (TO_DAYS('2012-05-01')),
PARTITION p_May VALUES LESS THAN (TO_DAYS('2012-06-01')), 
PARTITION p_Jun VALUES LESS THAN (TO_DAYS('2012-07-01')),  
PARTITION p_Jul VALUES LESS THAN (TO_DAYS('2012-08-01')),
PARTITION p_Aug VALUES LESS THAN (TO_DAYS('2012-09-01')),
PARTITION p_Sep VALUES LESS THAN (TO_DAYS('2012-10-01')),
PARTITION p_Oct VALUES LESS THAN (TO_DAYS('2012-11-01')),  
PARTITION p_Nov VALUES LESS THAN (TO_DAYS('2012-12-01')),
PARTITION p_Dec VALUES LESS THAN MAXVALUE );