MySQL Date Dimension Build Script

date.sql

/* Adapted from Tom Cunningham's 'Data Warehousing with MySql' (www.meansandends.com/mysql-data-warehouse) */

###### small-numbers table
DROP TABLE IF EXISTS numbers_small;
CREATE TABLE numbers_small (number INT);
INSERT INTO numbers_small VALUES (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);

###### main numbers table
DROP TABLE IF EXISTS numbers;
CREATE TABLE numbers (number BIGINT);
INSERT INTO numbers
SELECT thousands.number * 1000 + hundreds.number * 100 + tens.number * 10 + ones.number
  FROM numbers_small thousands, numbers_small hundreds, numbers_small tens, numbers_small ones
LIMIT 1000000;

###### date table
DROP TABLE IF EXISTS dates;
CREATE TABLE dates (
  date_id          BIGINT PRIMARY KEY, 
  date             DATE NOT NULL,
  timestamp        BIGINT NOT NULL, 
  weekend          CHAR(10) NOT NULL DEFAULT "Weekday",
  day_of_week      CHAR(10) NOT NULL,
  month            CHAR(10) NOT NULL,
  month_day        INT NOT NULL, 
  year             INT NOT NULL,
  week_starting_monday CHAR(2) NOT NULL,
  UNIQUE KEY `date` (`date`),
  KEY `year_week` (`year`,`week_starting_monday`)
);

###### populate it with days
INSERT INTO dates (date_id, date)
SELECT number, DATE_ADD( '2010-01-01', INTERVAL number DAY )
  FROM numbers
  WHERE DATE_ADD( '2010-01-01', INTERVAL number DAY ) BETWEEN '2010-01-01' AND '2020-01-01'
  ORDER BY number;

###### fill in other rows
UPDATE dates SET
  timestamp =   UNIX_TIMESTAMP(date),
  day_of_week = DATE_FORMAT( date, "%W" ),
  weekend =     IF( DATE_FORMAT( date, "%W" ) IN ('Saturday','Sunday'), 'Weekend', 'Weekday'),
  month =       DATE_FORMAT( date, "%M"),
  year =        DATE_FORMAT( date, "%Y" ),
  month_day =   DATE_FORMAT( date, "%d" );

UPDATE dates SET week_starting_monday = DATE_FORMAT(date,'%v');

Currently creates a date for every day between January 1, 2010 and January 1, 2020.

breaks at line 33 with error:
Field 'timestamp' doesn't have a default value

I fixed it: https://gist.github.com/leo90skk/69790149458a8f23767a88f03f2295ba

I needed to add in defaults for all of the not null columns that are not given a value in the insert

Very nice!
I used Date::Holidays::DE to also mark the local holidays:

#!/usr/bin/perl -w
use Date::Holidays::DE qw(holidays);
#my $feiertage_ref = holidays();
$feiertage_ref = holidays(FORMAT=>"%Y%m%d", YEAR=>2019, WEEKENDS=>1,WHERE=>['common', 'by'] );
#$feiertage_ref = holidays(WEEKENDS=>0);
my @feiertage = @$feiertage_ref;
print "$feiertage_ref\n";
print "@feiertage\n";