If you need to make a new table from a selection of data, or to merge two tables into one new table, you can use a make-table query.For more information about update queries or make-table queries, or for general information about other ways to add records to a database or change existing data, see the See Also section.Each assignment specifies a column name on the left side the assignment operator (=) and a literal value, an expression, or data from a subquery on the right side of the assignment operator.Third, the WHERE clause specifies the rows that you want to update.
I ran into a situation today when I need to update 10,000 records in a master table totaling 1,000,000 rows, and the value that I'm going to use comes from the accounting department. In sum, accounting wants to update job 103's invoice amount to 0 and job 104's invoice amount to 0, while leaving all other amounts the same.
You can indicate unknown data by setting values to NULL.
This works only if a column is nullable, meaning that it is not defined as NOT NULL.
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If you are an application programmer then you will more than likely need to write TSQL code to update your SQL Server database tables.