I'm out of practice with sql server but thought it would be fun to see what chatgpt has to say.
I have not reviewed this and cannot vouch for it!
My prompt:
Write a table trigger for microsoft sql server that for a new record will set a field's value. The field is called purchase_order_code. The field is a string data type. The field will be comprised of three parts, the first part is the current four digit year, the second part is a unique code to the supplier, the third part is the order count for that supplier for that year. The third part is also left zero padded to 3 digits. The three parts should be separated by an underscore. For example, if a new record is being entered for supplier 'ACME', and this is the 3rd purchase for this year, the trigger should look up the suppliers unique code which is 'A', and lookup the number of previous purchases this year, and finally set the purchase_order_code field to '2023_A_003'
ChatGPT response:
Here's an example of a table trigger in Microsoft SQL Server that sets the value of the `purchase_order_code` field based on the requirements you provided:
Code:
CREATE TRIGGER trg_SetPurchaseOrderCode
ON YourTableName -- Replace YourTableName with the actual name of your table
AFTER INSERT
AS
BEGIN
-- Variables to store the parts of the purchase_order_code
DECLARE @year CHAR(4)
DECLARE @supplierCode CHAR(1)
DECLARE @orderCount INT
-- Get the current year
SET @year = YEAR(GETDATE())
-- Get the supplier code for the newly inserted record
SELECT @supplierCode = supplier_code
FROM inserted
-- Calculate the order count for the supplier and year
SET @orderCount = (
SELECT COUNT(*)
FROM YourTableName -- Replace YourTableName with the actual name of your table
WHERE YEAR(order_date) = @year
AND supplier_code = @supplierCode
)
-- Generate the purchase_order_code by concatenating the parts
DECLARE @purchaseOrderCode VARCHAR(50)
SET @purchaseOrderCode = CONCAT(
@year, '_', @supplierCode, '_', RIGHT('000' + CAST(@orderCount AS VARCHAR(3)), 3)
)
-- Update the inserted record with the generated purchase_order_code
UPDATE YourTableName -- Replace YourTableName with the actual name of your table
SET purchase_order_code = @purchaseOrderCode
FROM inserted
WHERE YourTableName.PrimaryKeyColumn = inserted.PrimaryKeyColumn -- Replace PrimaryKeyColumn with the actual primary key column of your table
END
Make sure to replace `YourTableName` with the actual name of your table and `PrimaryKeyColumn` with the actual primary key column of your table.
This trigger will be fired after an `INSERT` operation on the table. It calculates the current year and retrieves the supplier code from the newly inserted record. Then, it counts the number of orders for the supplier within the current year. Finally, it generates the `purchase_order_code` by concatenating the parts and updates the inserted record with the generated value.
EDIT
NOTE: I notice that the supplierCode above looks wrong. I assume you'll want to add a call to lookup your supplier code in a related table.
Apologies for the oversight. If the supplier code is stored in a separate table and needs to be looked up based on the supplier foreign key field in the record, you can modify the trigger as follows:
Code:
CREATE TRIGGER trg_SetPurchaseOrderCode
ON YourTableName -- Replace YourTableName with the actual name of your table
AFTER INSERT
AS
BEGIN
-- Variables to store the parts of the purchase_order_code
DECLARE @year CHAR(4)
DECLARE @supplierCode CHAR(1)
DECLARE @orderCount INT
-- Get the current year
SET @year = YEAR(GETDATE())
-- Get the supplier code for the newly inserted record
SELECT @supplierCode = s.supplier_code
FROM inserted i
INNER JOIN SuppliersTable s ON i.supplier_foreign_key = s.supplier_id -- Replace SuppliersTable, supplier_foreign_key, and supplier_id with the actual names of your supplier table and columns
WHERE i.PrimaryKeyColumn = inserted.PrimaryKeyColumn -- Replace PrimaryKeyColumn with the actual primary key column of your table
-- Calculate the order count for the supplier and year
SET @orderCount = (
SELECT COUNT(*)
FROM YourTableName -- Replace YourTableName with the actual name of your table
WHERE YEAR(order_date) = @year
AND supplier_foreign_key = i.supplier_foreign_key
)
-- Generate the purchase_order_code by concatenating the parts
DECLARE @purchaseOrderCode VARCHAR(50)
SET @purchaseOrderCode = CONCAT(
@year, '_', @supplierCode, '_', RIGHT('000' + CAST(@orderCount AS VARCHAR(3)), 3)
)
-- Update the inserted record with the generated purchase_order_code
UPDATE YourTableName -- Replace YourTableName with the actual name of your table
SET purchase_order_code = @purchaseOrderCode
FROM inserted
WHERE YourTableName.PrimaryKeyColumn = inserted.PrimaryKeyColumn -- Replace PrimaryKeyColumn with the actual primary key column of your table
END
Ensure that you replace `YourTableName` with the actual name of your table, `SuppliersTable` with the actual name of your supplier table, and `supplier_foreign_key` and `supplier_id` with the corresponding foreign key and primary key columns in your tables.
This updated trigger will retrieve the supplier code by joining the `inserted` table with the `SuppliersTable` based on the supplier foreign key. The rest of the trigger logic remains the same as in the previous example.