sqlite change date format of every cell in column

Question

I have a table with a large number of rows. One column contains dates in the format \'%m/%d/%Y\' and I want to change all of them to format \'%Y-%m-%d\'

the usual: upd

Answer 1

If the fields in the date string are properly padded with zeros, you can extract them as substrings:

UPDATE MyTable
SET MyDate = substr(MyDate, 7, 4) || '-' ||
             substr(MyDate, 1, 2) || '-' ||
             substr(MyDate, 4, 2)