Fill a date field in mysql by the year, month, day, hour and minute from other columns

Question

i have a MySql table full of measurement data.

The measurement date in the table is stored in 5 separate columns: year, month, day, hour, minute.

What i would like to do is to add an extra column with the complete date, in a DateTime format.

So when i have the values

 year, month, day, hour, minute
  2013  ,1,    13,  17,    15,

there is a datetime field filled with the value '2013-01-13 17:15:00'

I'll add the column first, and after that i would like to execute a sql statement to fill the datetime field.

Can you help me with this sql statement?

(i don't know if it matters, but the statement should run from phpmyadmin)

Answer 1

尝试这个

UPDATE myTable set completeValue=CONCAT(year,"-",month,"-",day," ",hour,":",minute)

Answer 2

执行此操作的SQL标准方法是：

SELECT COALESCE(field1, '-') || COALESCE(field2, '-') || COALESCE(field3, '-') || COALESCE(field4, ':') || COALESCE(field5, ':') FROM table into table.field6