Oracle SQL script to generate Date Dimension data for use in Microsoft Excel Data Models

Date dimension is that one dimension or business perspective without which an Excel Data Model cannot ever exist. Here is an Oracle SQL script to generate the data for a Date Dimension. All that you have to do is change the start date and end date values in the in the last line of the below SQL query and execute it. Try it and experience the magic..!! Please leave your suggestions, comments and any enhancements that you might want to see in this.

Here is the downloadable script on Oracle LiveSQL:

/***********************
Description: Date Dimension Data Generation
Date Created: 14/Nov/2016
Author: Balakrishna Sappa
************************/

CREATE OR REPLACE TYPE DATE_OBJ AS OBJECT(DATE_KEY VARCHAR2(8), DATE_DT DATE, DATE_TYPE VARCHAR2(10), DAY_OF_MONTH SMALLINT, CAL_DAY_OF_YEAR SMALLINT, DAY_OF_WEEK_FULL_NAME VARCHAR2(9)
, DAY_OF_WEEK_SHORT_NAME CHAR(3), CAL_MONTH_FULL_NAME VARCHAR2(9), CAL_MONTH_SHORT_NAME CHAR(3), CAL_MONTH_ENUM SMALLINT, CAL_QTR_NAME CHAR(2), CAL_QTR_ENUM SMALLINT, CAL_HYR_NAME CHAR(2)
, CAL_HYR_ENUM SMALLINT, CAL_YEAR INT, START_OF_MONTH DATE, END_OF_MONTH DATE);
CREATE OR REPLACE TYPE CALENDAR_DATES IS TABLE OF DATE_OBJ;
CREATE OR REPLACE FUNCTION UDF_CALENDAR_GENERATOR(START_DATE IN DATE, END_DATE IN DATE)
RETURN CALENDAR_DATES
IS
CALENDAR_DATE CALENDAR_DATES;
BEGIN
SELECT CAST(MULTISET(WITH RCTE_DATES (DATE_DT)
AS
(SELECT START_DATE AS DATE_DT
FROM DUAL
UNION ALL
SELECT DATE_DT + 1 AS DATE_DT
FROM RCTE_DATES
WHERE DATE_DT + 1 <= END_DATE
)
SELECT CAST(EXTRACT(YEAR FROM DATE_DT) AS CHAR(4)) || SUBSTR(’00’ || EXTRACT(MONTH FROM DATE_DT), -2,2) || SUBSTR(’00’ || EXTRACT(DAY FROM DATE_DT), -2, 2) AS DATE_KEY
, DATE_DT
, ‘DATE’ AS DATE_TYPE
, EXTRACT(DAY FROM DATE_DT) AS DAY_OF_MONTH
, CAST(TO_CHAR(DATE_DT, ‘DDD’) AS SMALLINT) AS CAL_DAY_OF_YEAR
, TO_CHAR(DATE_DT, ‘DAY’) AS DAY_OF_WEEK_FULL_NAME
, TO_CHAR(DATE_DT, ‘DY’) AS DAY_OF_WEEK_SHORT_NAME
, TO_CHAR(DATE_DT, ‘MONTH’) AS CAL_MONTH_FULL_NAME
, TO_CHAR(DATE_DT, ‘MON’) AS CAL_MONTH_SHORT_NAME
, EXTRACT(MONTH FROM DATE_DT) AS CAL_MONTH_ENUM
, ‘Q’ || TO_CHAR(DATE_DT, ‘Q’) AS CAL_QTR_NAME
, CAST(TO_CHAR(DATE_DT, ‘Q’) AS SMALLINT) AS CAL_QTR_ENUM
, ‘H’ || CASE WHEN EXTRACT(MONTH FROM DATE_DT) IN (1,2,3,4,5,6)
THEN 1
ELSE 2
END AS CAL_HYR_NAME
, CASE WHEN EXTRACT(MONTH FROM DATE_DT) IN (1,2,3,4,5,6)
THEN 1
ELSE 2
END AS CAL_HYR_ENUM
, EXTRACT(YEAR FROM DATE_DT) AS CAL_YEAR
, TRUNC(DATE_DT, ‘MONTH’) AS START_OF_MONTH
, TRUNC(ADD_MONTHS(DATE_DT, 1), ‘MONTH’)-1 AS END_OF_MONTH
FROM RCTE_DATES
UNION
SELECT ‘999999’ AS DATE_KEY
, TO_DATE(’31-DEC-9999′, ‘DD-MON-YYYY’) AS DATE_DT
, ‘NA’ AS DATE_TYPE
, 0 AS DAY_OF_MONTH
, 0 AS CAL_DAY_OF_YEAR
, ‘NA’ AS DAY_OF_WEEK_FULL_NAME
, ‘NA’ AS DAY_OF_WEEK_SHORT_NAME
, ‘NA’ AS CAL_MONTH_FULL_NAME
, ‘NA’ AS CAL_MONTH_SHORT_NAME
, 0 AS CAL_MONTH_ENUM
, ‘NA’ AS CAL_QTR_NAME
, 0 AS CAL_QTR_ENUM
, ‘NA’ AS CAL_HYR_NAME
, 0 AS CAL_HYR_ENUM
, 9999 AS CAL_YEAR
, TO_DATE(’31-DEC-9999′, ‘DD-MON-YYYY’) AS START_OF_MONTH
, TO_DATE(’31-DEC-9999′, ‘DD-MON-YYYY’) AS END_OF_MONTH
FROM DUAL
)
AS CALENDAR_DATES
)
INTO CALENDAR_DATE
FROM DUAL;
RETURN CALENDAR_DATE;
END;

Below is as screenshot of the results of this SQL executed in Oracle’s fee online SQL learning and execution tool: Oracle Live SQL.

datedimensiondatagenerator

 

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