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Amending php myadmin sql database

Posted on 2014-11-10
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Last Modified: 2014-11-10
Hello,

I need some help/advice on updating my database.

Stupidly i set my Date column structure to varchar(250) then populated the database with 226048 rows of code  :(

is there away i can convert the current date (displayed like 18/10/2014) and then convert the column to be Date ??
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Question by:runnerjp2005
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6 Comments
 
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Expert Comment

by:John Easton
ID: 40432706
You should be able to create a new date column, and then update it with the date in the varchar column.  After checking the data you can then drop the varchar column.
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Author Comment

by:runnerjp2005
ID: 40432712
Thats a good idea!!!

what sql statement would i need to update from `date` to date2?
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LVL 11

Expert Comment

by:John Easton
ID: 40432722
I've only done this in MS SQL, but MySQL should be able to do the same.  From memory (assuming you are editing every row in the table) all you should need to do is (replacing the field and table name accordingly):

UPDATE myTable SET newDate = oldDate

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Needless to say, if this is a live system please backup first.  Any SQL that can update large volumes of data could cause data loss if it fails, has a typo etc.
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Author Comment

by:runnerjp2005
ID: 40432729
Yer currently doing this on a copy of the table

UPDATE `horses2` SET `Date2` = `Date`

tried the above and it updates 0 rows :S
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LVL 11

Accepted Solution

by:
John Easton earned 500 total points
ID: 40432743
Just created a table to test this, and got the same result.  You need to add the Str_to_date function as shown below:
UPDATE `datetest` SET `newdate`=STR_TO_DATE(`olddate`,'%d/%m/%Y')

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This assumes all the dates are entered in UK format (i.e. 20/01/2014).  If the format is different you should edit the format.  Guidance is available here:  Date Format
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Author Closing Comment

by:runnerjp2005
ID: 40432744
Ta Bud saved me ALOT of time there :)
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