AdventureWorks Database: Return a truncated date with 4 months added to the orderdate

Last update on December 20 2024 11:37:55 (UTC/GMT +8 hours)

182. From the following table write a query in SQL to return a truncated date with 4 months added to the orderdate.

Sample table: sales.salesorderheader

salesorderid|revisionnumber|orderdate              |duedate                |shipdate               |status|onlineorderflag|purchaseordernumber|accountnumber |customerid|salespersonid|territoryid|billtoaddressid|shiptoaddressid|shipmethodid|creditcardid|creditcardapprovalcode|currencyrateid|subtotal   |taxamt    |freight  |totaldue   |comment|rowguid                             |modifieddate           |
------------+--------------+-----------------------+-----------------------+-----------------------+------+---------------+-------------------+--------------+----------+-------------+-----------+---------------+---------------+------------+------------+----------------------+--------------+-----------+----------+---------+-----------+-------+------------------------------------+-----------------------+
       43659|             8|2011-05-31 00:00:00.000|2011-06-12 00:00:00.000|2011-06-07 00:00:00.000|     5|false          |PO522145787        |10-4020-000676|     29825|          279|          5|            985|            985|           5|       16281|105041Vi84182         |              | 20565.6206| 1971.5149| 616.0984| 23153.2339|       |79b65321-39ca-4115-9cba-8fe0903e12e6|2011-06-07 00:00:00.000|
       43660|             8|2011-05-31 00:00:00.000|2011-06-12 00:00:00.000|2011-06-07 00:00:00.000|     5|false          |PO18850127500      |10-4020-000117|     29672|          279|          5|            921|            921|           5|        5618|115213Vi29411         |              |  1294.2529|  124.2483|  38.8276|  1457.3288|       |738dc42d-d03b-48a1-9822-f95a67ea7389|2011-06-07 00:00:00.000|
       43661|             8|2011-05-31 00:00:00.000|2011-06-12 00:00:00.000|2011-06-07 00:00:00.000|     5|false          |PO18473189620      |10-4020-000442|     29734|          282|          6|            517|            517|           5|        1346|85274Vi6854           |             4| 32726.4786| 3153.7696|  985.553| 36865.8012|       |d91b9131-18a4-4a11-bc3a-90b6f53e9d74|2011-06-07 00:00:00.000|
       43662|             8|2011-05-31 00:00:00.000|2011-06-12 00:00:00.000|2011-06-07 00:00:00.000|     5|false          |PO18444174044      |10-4020-000227|     29994|          282|          6|            482|            482|           5|       10456|125295Vi53935         |             4| 28832.5289| 2775.1646| 867.2389| 32474.9324|       |4a1ecfc0-cc3a-4740-b028-1c50bb48711c|2011-06-07 00:00:00.000|
       43663|             8|2011-05-31 00:00:00.000|2011-06-12 00:00:00.000|2011-06-07 00:00:00.000|     5|false          |PO18009186470      |10-4020-000510|     29565|          276|          4|           1073|           1073|           5|        4322|45303Vi22691          |              |   419.4589|   40.2681|  12.5838|   472.3108|       |9b1e7a40-6ae0-4ad3-811c-a64951857c4b|2011-06-07 00:00:00.000|
       43664|             8|2011-05-31 00:00:00.000|2011-06-12 00:00:00.000|2011-06-07 00:00:00.000|     5|false          |PO16617121983      |10-4020-000397|     29898|          280|          1|            876|            876|           5|         806|95555Vi4081           |              | 24432.6088| 2344.9921|   732.81| 27510.4109|       |22a8a5da-8c22-42ad-9241-839489b6ef0d|2011-06-07 00:00:00.000|
       43665|             8|2011-05-31 00:00:00.000|2011-06-12 00:00:00.000|2011-06-07 00:00:00.000|     5|false          |PO16588191572      |10-4020-000146|     29580|          283|          1|            849|            849|           5|       15232|35568Vi78804          |              | 14352.7713| 1375.9427| 429.9821| 16158.6961|       |5602c304-853c-43d7-9e79-76e320d476cf|2011-06-07 00:00:00.000|
	   -- more --

Click to view Full table

Sample Solution:


-- Selecting the orderdate column and applying a date truncation to the month level
SELECT orderdate, DATE_TRUNC('month', (SELECT orderdate + interval '4 month'))
-- Selecting from the Salesorderheader table
FROM Sales.salesorderheader;

Explanation:

This SQL query retrieves data from the sales order header table.
Comments are added to explain each part of the query for better understanding and maintenance.
Here's a breakdown of what the query does:

It selects the orderdate column from the sales order header table.
It applies the DATE_TRUNC function to truncate the date to the beginning of the month.
Inside the DATE_TRUNC function, it calculates a new date by adding 4 months to the orderdate.
The result is the truncated date to the month level for each orderdate plus 4 months.
It retrieves data from the Salesorderheader table.

Sample Output:

orderdate              |date_trunc             |
-----------------------+-----------------------+
2011-05-31 00:00:00.000|2011-09-01 00:00:00.000|
2011-05-31 00:00:00.000|2011-09-01 00:00:00.000|
2011-05-31 00:00:00.000|2011-09-01 00:00:00.000|
2011-05-31 00:00:00.000|2011-09-01 00:00:00.000|
2011-05-31 00:00:00.000|2011-09-01 00:00:00.000|
2011-05-31 00:00:00.000|2011-09-01 00:00:00.000|
2011-05-31 00:00:00.000|2011-09-01 00:00:00.000|
2011-05-31 00:00:00.000|2011-09-01 00:00:00.000|
2011-05-31 00:00:00.000|2011-09-01 00:00:00.000|
2011-05-31 00:00:00.000|2011-09-01 00:00:00.000|
2011-05-31 00:00:00.000|2011-09-01 00:00:00.000|
2011-05-31 00:00:00.000|2011-09-01 00:00:00.000|
...

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