How Can I Automate Daily Inventory Valuation Reports in MySQL?

Scheduling MySQL Queries

The Event Scheduler feature in MySQL allows users to schedule tasks to run at specified intervals. This functionality is beneficial in various scenarios, such as periodic data backups or generating reports on a regular basis.

Case Study: Inventory Valuation

You have an inventory database where you need to generate reports on item-wise valuation for past dates. While you can manually calculate the valuation for current stock, you need a way to track the historical valuation as well.

Solution: Using Event Scheduler

To schedule a query that dumps valuation data into a separate table, follow these steps:

1. Create a destination table:

   CREATE TABLE stock_dumps (
       itemcode VARCHAR(255),
       quantity INT,
       avgcost DECIMAL(10,2),
       ttlval DECIMAL(10,2),
       dump_date DATETIME
   );

2. Setup scheduling:

   CREATE EVENT Dumping_event
   ON SCHEDULE EVERY 1 DAY
   ON COMPLETION NOT PRESERVE
   ENABLE
   DO
   BEGIN
       INSERT INTO stock_dumps (
           itemcode,
           quantity,
           avgcost,
           ttlval,
           dump_date
       )
       SELECT
           itmcode,
           quantity,
           avgcost,
           (avgcost * quantity) AS ttlval,
           NOW()
       FROM table_1
       JOIN table_2 ON table_1.itmcode = table_2.itmcode;
   END;

Alternative: Using Cron/Scheduled Job

If you prefer not to use Event Scheduler, you can create a cron job or scheduled task that executes a SQL file containing the dump query regularly.

1. Create a SQL file:

   INSERT INTO stock_dumps (
       itemcode,
       quantity,
       avgcost,
       ttlval,
       dump_date
   )
   SELECT
       itmcode,
       quantity,
       avgcost,
       (avgcost * quantity) AS ttlval,
       NOW()
   FROM table_1
   JOIN table_2 ON table_1.itmcode = table_2.itmcode;

2. Schedule the job:

   mysql -u [user] -p [password] < /path/to/SQL_file.sql

By scheduling this query daily or as frequently as required, you can maintain a historical record of inventory valuations and generate reports for any past date.

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