在sql中将varchar转换为日期时间

Question

currently in my DB i have

20181015 151706 ---------- varchar(15)
2018-10-15 15:17:06 000--- Datetime

how do i convert this from varchar to datetime ?

i have tried using this command below

SELECT CONVERT(Datetime,CREATE_TIME , 120) from TABLE

but im getting error

"The conversion of a varchar data type to a datetime data type resulted in an out-of-range value."

SELECT CONVERT(Datetime,CREATE_TIME , 120) from TABLE

Answer 1

The error caused by your special 20181015 151706 varchar DateTime value,

you can try to use substring function make the DateTime format string value then do convert .

SELECT CONVERT(DATETIME,CONCAT(substring(col, 1, 4),'-',substring(col, 5, 2),'-',substring(col, 7, 2),' ',substring(col, 9, 2),':',substring(col, 11, 2),':',substring(col, 13, 2)))
FROM (
   select REPLACE('20181015 151706',' ','') col
) t1

sqlfiddle

Answer 2

There's a little issue with your date string. It works when 20181015 151706 is changed to just the date part 20181015 .

SELECT CONVERT(DATETIME, col)
FROM (
   select '20181015' col
) t1