Sql updating table from another table


14-Sep-2017 01:53

sql updating table from another table-81

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The SQL Server (Transact-SQL) UPDATE statement is used to update existing records in a table in a SQL Server database.

There are 3 syntaxes for the UPDATE statement depending on whether you are performing a traditional update or updating one table with data from another table.

When asked the reason was he had no idea how to use multiple tables with the help of the JOIN clause in the UPDATE statement. Additionally, we want to update the values of Col2 and Col3 only.

In recent times I have seen a developer writing a cursor to update a table. We want to update the value from Table2 to Table1 for the rows where Col1 is 21 and 31. I resolved this by providing the alias name after update query:: UPDATE Table1 SET Col2 = t2. In case of an inner join (like here), the unmatched row(s) just won't be updated.But if you indeed meant a column that exists in one table and doesn't exist in the other, then I believe that's one more new question to ask separately.Specifies the temporary named result set or view, also known as common table expression (CTE), defined within the scope of the UPDATE statement.

sql updating table from another table-55

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The CTE result set is derived from a simple query and is referenced by UPDATE statement.

Database1 (Test1) is the latest, and database2 (Test2) is an old copy of the database.



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