Stored procedure to Insert data between tables - sql

Question

I want to insert data from a table called temp_menu into another called menu.
They have the same structure, they store the same data, I want to create a stored procedure to check the differences between the tables. If there are any different rows and the rows don't exist in table menu, I want to insert them into menu; if the rows exists, I want to update the rows in menu if the DateReg column is higher that the DateReg column in the temp_menu table.
The tables have this structure:
CREATE TABLE [dbo].[Menu_Temp]
(
[Date] [datetime] NOT NULL,
[Ref] [int] NOT NULL,
[Art] [char](60) NOT NULL,
[Dish] [char](60) NOT NULL,
[DateReg] [datetime] NOT NULL,
[Zone] [char](60) NOT NULL,
);
I have this code to check for differences between the tables:
SELECT *
INTO #diffs
FROM [Regi].dbo.menu
EXCEPT
SELECT * FROM [Regi].dbo.menu_Temp
IF ##ROWCOUNT = 0
RETURN
SELECT * FROM #diffs

Answer 1

Full details are here : https://learn.microsoft.com/en-us/sql/t-sql/statements/merge-transact-sql
An example for your situation could be...
MERGE
[Regi].dbo.menu
USING
[Regi].dbo.menu_Temp
ON (menu_Temp.[Ref] = menu.[Ref]) -- Assumes [Ref] is the identifying column?
WHEN
MATCHED AND (menu_Temp.[DateReg] > menu.[DateReg])
THEN
UPDATE SET [Art] = menu_Temp.[Art],
[Dish] = menu_Temp.[Dish],
[Zone] = menu_Temp.[Zone],
[Date] = menu_Temp.[Date],
[DateReg] = menu_Temp.[DateReg]
WHEN
NOT MATCHED
THEN
INSERT (
[Date],
[Ref],
[Art],
[Dish],
[DateReg],
[Zone]
)
VALUES (
menu_Temp.[Date],
menu_Temp.[Ref],
menu_Temp.[Art],
menu_Temp.[Dish],
menu_Temp.[DateReg],
menu_Temp.[Zone]
)
http://dbfiddle.uk/?rdbms=sqlserver_2017&fiddle=b47d7e879856ffe6210589f6bb64829f