mysql - MySQL 数据库错误：（子）分区函数中不允许使用常量、随机或时区相关的表达式

Question

我试图通过timestampinmysql表进行分区。但它返回一个错误

CREATE TABLE tblemployeepunch (
  fld_id int(11) NOT NULL AUTO_INCREMENT,
  fld_date Varchar(15) DEFAULT NULL,
  fld_rawpunchdate varchar(25) DEFAULT NULL,
  fld_rawpunchtime varchar(25) DEFAULT NULL,
  fld_cardno varchar(50) DEFAULT NULL,
  fld_reasoncard varchar(20) DEFAULT NULL,
  fld_mode varchar(20) DEFAULT NULL,
  fld_punchdatetime varchar(50) DEFAULT NULL,
  fld_crtdate  TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
  UNIQUE KEY fld_id (fld_id,fld_crtdate),
  KEY in_timesheet (fld_cardno,fld_punchdatetime,fld_mode,fld_rawpunchtime),
  KEY in_emppunch (fld_cardno,fld_rawpunchdate,fld_punchdatetime)
  )
  PARTITION BY HASH(DAYOFYEAR(fld_crtdate))
PARTITIONS 12;

Answer 1

嗯，错误信息很清楚。不要按时区相关列中的值进行分区。使用具有 datatype 的列date，datetime或int（通过DAYOFYEAR(fld_crtdate)预先在单独的列中计算）或任何其他列。