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mysqlsqldate

Get mySQL MONTH() to use leading zeros?

How do I specify to mySQL's MONTH() function to return '08' instead of 8 in this query?

I'd like the sort to work datewise. Currently getting results for date like

2006-9
2007-1
2007-10
2007-11

current query:

SELECT COUNT(*), CONCAT(YEAR(`datetime_added`), '-', MONTH(`datetime_added`)) as date FROM `person` WHERE (email = '' OR email IS NULL) 
GROUP BY date 
ORDER BY date ASC
Solution

  • Use the following instead:

    DATE_FORMAT(`datetime_added`,'%Y-%m')

    Explanation:

    DATE_FORMAT() function lets you format the date anyway you like using specifiers described in the table below (taken verbatim from documentation). So a format string '%Y-%m' means: "A full year (4 digits), followed by a dash (-), followed by a two-digit month number".

    Note that you can specify the language used for day/month names by setting lc_time_names system variable. Extremely useful. Refer to documentation for more details.

    Specifier Description
    %a Abbreviated weekday name (Sun..Sat)
    %b Abbreviated month name (Jan..Dec)
    %c Month, numeric (0..12)
    %D Day of the month with English suffix (0th, 1st, 2nd, 3rd, …)
    %d Day of the month, numeric (00..31)
    %e Day of the month, numeric (0..31)
    %f Microseconds (000000..999999)
    %H Hour (00..23)
    %h Hour (01..12)
    %I Hour (01..12)
    %i Minutes, numeric (00..59)
    %j Day of year (001..366)
    %k Hour (0..23)
    %l Hour (1..12)
    %M Month name (January..December)
    %m Month, numeric (00..12)
    %p AM or PM
    %r Time, 12-hour (hh:mm:ss followed by AM or PM)
    %S Seconds (00..59)
    %s Seconds (00..59)
    %T Time, 24-hour (hh:mm:ss)
    %U Week (00..53), where Sunday is the first day of the week; WEEK() mode 0
    %u Week (00..53), where Monday is the first day of the week; WEEK() mode 1
    %V Week (01..53), where Sunday is the first day of the week; WEEK() mode 2; used with %X
    %v Week (01..53), where Monday is the first day of the week; WEEK() mode 3; used with %x
    %W Weekday name (Sunday..Saturday)
    %w Day of the week (0=Sunday..6=Saturday)
    %X Year for the week where Sunday is the first day of the week, numeric, four digits; used with %V
    %x Year for the week, where Monday is the first day of the week, numeric, four digits; used with %v
    %Y Year, numeric, four digits
    %y Year, numeric (two digits)
    %% A literal % character
    %x x, for any “x” not listed above