MySql通过查询将两个日期列合并为一列

Question

我有两个日期列from和to我想查询

SELECT cast(E.From as varchar(20)) + ' to ' + cast(E.To as varchar(20)) DateRange,  
       E.Reason, L.Title as LeaveType 
  FROM employeeleave E 
       LEFT JOIN listitems L ON E.LeaveTypeID = L.ListItemID

并制作新列daterange。

我的查询无效。

如何在mysql中将日期值转换为varchar。

Answer 1

我想你需要concat

SELECT concat(E.From,' to ',E.To) DateRange,
E.Reason,
L.Title as LeaveType 
from employeeleave E 
LEFT JOIN listitems L ON E.LeaveTypeID = L.ListItemID