Sql updating multiple tables simultaneously

You would need to write separate INSERT, UPDATE and DELETE statements to refresh the target table with an updated product list or do lookups.

sql updating multiple tables simultaneously-79sql updating multiple tables simultaneously-76sql updating multiple tables simultaneously-69

Here is how to get started with the SQL Server MERGE command: Check out the example below with product data to get started down the path of becoming an expert with the SQL Server MERGE command to streamline your T-SQL logic. Rate --When no records are matched, insert the incoming records from source table to target table WHEN NOT MATCHED BY TARGET THEN INSERT (Product ID, Product Name, Rate) VALUES (SOURCE. In a typical data warehousing application, quite often during the ETL cycle you need to perform INSERT, UPDATE and DELETE operations on a target table by matching the records from the source table.For example, a products dimension table has information about the products and you need to sync-up this table with the latest information about the products from the source table.SELECT * FROM table_1 CROSS JOIN table_2;-- id | value1 | id | value2-- ---- -------- ---- ---------- 1 | a | 1 | W-- 1 | a | 1 | X-- 1 | a | 3 | Y-- 1 | a | 5 | Z-- 2 | b | 1 | W-- 2 | b | 1 | X-- 2 | b | 3 | Y-- 2 | b | 5 | Z-- 3 | c | 1 | W-- 3 | c | 1 | X-- 3 | c | 3 | Y-- 3 | c | 5 | ZSELECT * FROM table_1, table_2;-- id | value1 | id | value2-- ---- -------- ---- ---------- 1 | a | 1 | W-- 1 | a | 1 | X-- 1 | a | 3 | Y-- 1 | a | 5 | Z-- 2 | b | 1 | W-- 2 | b | 1 | X-- 2 | b | 3 | Y-- 2 | b | 5 | Z-- 3 | c | 1 | W-- 3 | c | 1 | X-- 3 | c | 3 | Y-- 3 | c | 5 | Z are equivalent.Because outer joins are defined in terms of inner joins, generating the result set for a query can involve alternating periods where rows are added and where rows are removed.

Leave a Reply