Search results
20 wrz 2008 · Assuming that you want to insert/update single row, most optimal approach is to use SQL Server's REPEATABLE READ transaction isolation level: SET TRANSACTION ISOLATION LEVEL REPEATABLE READ; BEGIN TRANSACTION IF (EXISTS (SELECT * FROM myTable WHERE key=@key) UPDATE myTable SET ...
20 sty 2015 · MERGE dbo.Test WITH (SERIALIZABLE) AS T USING (VALUES (3012, 'john')) AS U (id, name) ON U.id = T.id WHEN MATCHED THEN UPDATE SET T.name = U.name WHEN NOT MATCHED THEN INSERT (id, name) VALUES (U.id, U.name); The SERIALIZABLE hint is required for correct operation under high concurrency.
Learn how to use the SQL UPDATE statement to modify the existing records in a table. See examples, syntax, demo database and exercises on updating multiple records or single records.
23 maj 2023 · CREATE TABLE dbo.T1 ( column_1 int IDENTITY, column_2 VARCHAR(30)); GO INSERT T1 VALUES ('Row #1'); INSERT T1 (column_2) VALUES ('Row #2'); GO SET IDENTITY_INSERT T1 ON; GO INSERT INTO T1 (column_1,column_2) VALUES (-99, 'Explicit identity value'); GO SELECT column_1, column_2 FROM T1; GO
2 lut 2024 · Sometimes it may be required to Insert the data if the same data is already present in the table. In this article, we will look into the methods of updating data if already exists else insert the same data if the data does not exist, with examples.
3 sty 2020 · This article offers the basics of SQL INSERT, SQL UPDATE, and SQL DELETE, but if you want a more comprehensive tutorial, check out our How to INSERT, UPDATE, and DELETE Data in SQL course. It has everything you need to make DML statements child's play.
17 paź 2024 · The MERGE statement in SQL can insert a new record into a table or update the existing record if it already exists. It is supported by databases like Oracle, SQL Server, and PostgreSQL. Let’s look at how we can use the MERGE statement: MERGE INTO Department AS target.
