Updating joined tables in sql server

30-Sep-2019 16:19 by 3 Comments

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Unit Price In this example we are combining two concepts to show that more than two tables can be JOINed in one SELECT statement and more than one JOIN type can be used in a single SELECT statement. Sales Territory table, NULL values are returned for the columns in the Sales. In addition, this code uses two columns to order the data i.e.

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For example, you can synchronize two tables by inserting, updating, or deleting rows in one table based on differences found in the other table.

In the following lines, I am going to show you three tricks that have made my life simpler on many occasions.

For that, we first need two tables: If you want to follow along, you can get the script here: The Hidden SQL Server Gem - UPDATE from Now that we have the environment set up, let's dive into how to make this work.

In most cases, when using Transact-SQL to modify data in a SQL Server database, you issue an UPDATE statement that changes specific values.

You can issue an UPDATE statement against a table or updateable view, as long as the statement modifies data in only one base table at a time.

I also provide examples that demonstrate how the various clauses work.

I created the examples in the Adventure Works2008 database on a local instance of SQL Server 2008.

Update with Inner Join Example In the example above, NULL values rows in Table2 are updated with Table1 rows based on a matching ID column.

Before Update with Inner Join After Update with Inner Join Delete Using Inner Join Using the same concept of Inner join, we can delete rows from one table based on another table using Inner Join.

Syntax for Delete with Inner Join To simplify syntax, T2 is an alias name for Table2, whose rows we want to delete based on matching rows with Table1.

On clause specifies columns names to find matching rows between both tables using Inner Join.

If equal value are found in multiple columns from multiple tables, they are returned in the result set.