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mysql中创建时间维度
2020-11-09 07:41:22 责编:小采
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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 number


  • 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;

  • Create Date Dimension table
  • DROP TABLE IF EXISTS Dates_D;
    CREATE TABLE Dates_D (
    date_id BIGINT PRIMARY KEY,
    date DATE NOT NULL,
    day CHAR(10),
    day_of_week INT,
    day_of_month INT,
    day_of_year INT,
    previous_day date NOT NULL default '0000-00-00',
    next_day date NOT NULL default '0000-00-00',
    weekend CHAR(10) NOT NULL DEFAULT "Weekday",
    week_of_year CHAR(2),
    month CHAR(10),
    month_of_year CHAR(2),
    quarter_of_year INT,
    year INT,
    UNIQUE KEY `date` (`date`));

  • First populate with ids and Date
  • INSERT INTO Dates_D (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 '2010-12-31'
    ORDER BY number;

    Change year start and end to match your needs. The above sql creates records for year 2010.

  • Update other columns based on the date.
  • UPDATE Dates_D SET
    day = DATE_FORMAT( date, "%W" ),
    day_of_week = DAYOFWEEK(date),
    day_of_month = DATE_FORMAT( date, "%d" ),
    day_of_year = DATE_FORMAT( date, "%j" ),
    previous_day = DATE_ADD(date, INTERVAL -1 DAY),
    next_day = DATE_ADD(date, INTERVAL 1 DAY),
    weekend = IF( DATE_FORMAT( date, "%W" ) IN ('Saturday','Sunday'), 'Weekend', 'Weekday'),
    week_of_year = DATE_FORMAT( date, "%V" ),
    month = DATE_FORMAT( date, "%M"),
    month_of_year = DATE_FORMAT( date, "%m"),
    quarter_of_year = QUARTER(date),
    year = DATE_FORMAT( date, "%Y" );

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