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 dim_numbers_small;
CREATE TABLE dim_numbers_small (number INT);
INSERT INTO dim_numbers_small VALUES (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);

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

###### time table
DROP TABLE IF EXISTS dim_times;
CREATE TABLE dim_times (
  time_id              BIGINT PRIMARY KEY,
  time				   TIME,
  hour_12			   INT,
  hour_12_period	   CHAR(2),
  hour				   INT,
  minute			   INT,
  core_hour			   INT,
  standard_day		   INT
);

###### populate it with minutes
INSERT INTO dim_times (time_id, time)
SELECT number, DATE_ADD( '1970-01-01 00:00:00', INTERVAL number MINUTE )
  FROM dim_numbers
  ORDER BY number
  LIMIT 1440;
  
UPDATE dim_times SET
  hour_12 = 		  time_format(time, '%h'),
  hour_12_period =	  time_format(time, '%p'),
  hour =              hour(time),
  minute =            minute(time),
  core_hour = 		  if(hour between 9 and 16,1,0),
  standard_day = 	  1
;

###### date table
/* Additional fields to add later?
isthismonth
ispreviousfullmonth
*/
DROP TABLE IF EXISTS dim_dates;
CREATE TABLE dim_dates (
  date_id              BIGINT PRIMARY KEY, 
  julian_date          BIGINT,
  date                 DATE NOT NULL,
  timestamp            BIGINT,
  istoday              INT NOT NULL DEFAULT 0,
  isyesterday          INT NOT NULL DEFAULT 0,
  isweekend            INT NOT NULL DEFAULT 0,
  isworkday            INT NOT NULL DEFAULT 1,
  isthisweek           INT NOT NULL DEFAULT 0,
  islastweek           INT NOT NULL DEFAULT 0,
  isbankholiday        INT NOT NULL DEFAULT 0,
  bankholidaydesc      char(20),
  weekend_text         CHAR(10) NOT NULL DEFAULT "Weekday",
  day_of_week_full     CHAR(10),
  day_of_week_short    CHAR(3),
  day_of_week          INT,
  month                INT,
  month_full           CHAR(10),
  month_short          CHAR(3),
  first_date_of_month  DATE,
  last_date_of_month   DATE,
  days_in_month        INT,
  day_of_month         INT, 
  day_of_month_text    CHAR(5), 
  quarter              INT,
  year                 INT,
  year_month_number    INT,
  year_quarter_number  INT,
  year_week_number     INT,
  day_of_year          INT, 
  week_starting_monday CHAR(2),
  UNIQUE KEY `date` (`date`),
  KEY `year_week` (`year`,`week_starting_monday`)
);

###### populate it with days
INSERT INTO dim_dates (date_id, date)
SELECT number, DATE_ADD( '2012-01-01', INTERVAL number DAY )
  FROM dim_numbers
  WHERE DATE_ADD( '2012-01-01', INTERVAL number DAY ) BETWEEN '2012-01-01' AND '2022-01-01'
  ORDER BY number;

###### fill in other rows
UPDATE dim_dates SET
  timestamp =           UNIX_TIMESTAMP(date),
  julian_date =         TO_DAYS(date),
  day_of_week      =    IF(DATE_FORMAT( date, "%w" ) = 0,7,DATE_FORMAT( date, "%w" )),
  day_of_week_full =    DATE_FORMAT( date, "%W" ),
  day_of_week_short =   DATE_FORMAT( date, "%a" ),
  weekend_text =        IF( DATE_FORMAT( date, "%W" ) IN ('Saturday','Sunday'), 'Weekend', 'Weekday'),
  istoday =             IF( date = CURDATE(), 1, 0),
  isyesterday =         IF( date = (CURDATE()-1), 1, 0),
  isweekend =           IF( DATE_FORMAT( date, "%W" ) IN ('Saturday','Sunday'), 1, 0),
  isworkday =           IF( DATE_FORMAT( date, "%W" ) IN ('Saturday','Sunday'), 0, 1),
  isthisweek =          IF( YEARWEEK(date, 1) = YEARWEEK(CURDATE(), 1), 1, 0),
  islastweek =          IF( YEARWEEK(date, 1) = (YEARWEEK(CURDATE(), 1)-1), 1, 0),
  month =               DATE_FORMAT( date, "%m"),
  month_full =          DATE_FORMAT( date, "%M"),
  month_short =         DATE_FORMAT( date, "%b"),
  first_date_of_month=  date_add(date,interval -DAY(date)+1 DAY),
  last_date_of_month =  LAST_DAY(date),
  days_in_month =       DAY(LAST_DAY(date)),
  quarter =             QUARTER( date ),
  year =                DATE_FORMAT( date, "%Y" ),
  year_month_number =   CONCAT(DATE_FORMAT(date, "%Y"),DATE_FORMAT(date, "%m")),
  year_quarter_number = CONCAT(DATE_FORMAT(date, "%Y"),QUARTER(date)),
  year_week_number =    CONCAT(DATE_FORMAT(date, "%Y"),DATE_FORMAT(date, "%v")),
  day_of_month =        DATE_FORMAT( date, "%d" ),
  day_of_month_text =   DATE_FORMAT( date, "%D" ),
  day_of_year =         DATE_FORMAT( date, "%j" );

###### fill in other rows - second pass
UPDATE dim_dates SET week_starting_monday = DATE_FORMAT(date,'%v');

###### ideally populate bank holidays from https://www.gov.uk/bank-holidays / https://www.gov.uk/bank-holidays/england-and-wales.ics