Converting Oracle upsert to AzureSQL(T-SQL) prepared statement - tsql

Question

I want to migrate upsert queries from Oracle DB to AzureSQL. Below shows an Oracle prepared statement that takes values from dual and does an upsert operation on the DUMMY table.
MERGE INTO DUMMY a
USING (SELECT ? ID,
? NAME,
? SIZE from dual) b
ON (a.ID = b.ID)
WHEN MATCHED THEN
UPDATE
SET a.ID = b.ID,
a.NAME = b.NAME,
a.SIZE = b.SIZE
WHEN NOT MATCHED THEN
INSERT(a.ID,
a.NAME,
a.SIZE)
VALUES ( b.ID,
b.NAME,
b.SIZE)
I also asked for a migration from Oracle to Postgres earlier. This is the PostgreSQL version that I asked. I am looking for a way to convert into AzureSQL now.

Answer 1

Upsert for T-SQL.
MERGE dbo.table_name AS [Target]
USING (SELECT 1 AS Id, 'name' as t_name, 1 as size) AS [Source]
ON [Target].Id = [Source].Id
WHEN MATCHED THEN
UPDATE SET [Target].name = [Source].t_name, [Target].size = [Source].size
WHEN NOT MATCHED THEN
INSERT (Id, name, size) VALUES ([Source].Id, [Source].t_name, [Source].size);
Use parameter value for preparing source table
DECLARE #id int = 1,
#name varchar(10) = 'ABC',
#size int = 5
MERGE dbo.table_name AS [Target]
USING (SELECT #id AS Id, #name as t_name, #size as size) AS [Source]
ON [Target].Id = [Source].Id
WHEN MATCHED THEN
UPDATE SET [Target].name = [Source].t_name, [Target].size = [Source].size
WHEN NOT MATCHED THEN
INSERT (Id, name, size) VALUES ([Source].Id, [Source].t_name, [Source].size);
Please check from url https://dbfiddle.uk/?rdbms=sqlserver_2017&fiddle=13d32c099991dc3001fe4a8cd0b3fc77