Updating database with sql statement


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SQL UPDATE Statement




Note that you must include a personal server name for datasrc. The aural example rompers the vacation girls of the 10 hotels with the fastest growing dates.


The common table expression returns a hierarchical list of parts that are used directly to build ProductAssemblyID and parts that are used to build those components, and so on. Only the rows returned by the common table expression are modified. Other tables participating in the cursor are not affected. The example doubles the value in the ListPrice column for all rows in the Product table. Specifying a compound operator The following example uses the variable NewPrice to increment the price of all red bicycles by taking the current price and adding 10 to it.

Specifying a subquery in the SET clause The following example uses a subquery in the SET clause to determine the value that is used to update the column. The subquery must return only a scalar value that is, a single value per row. Specifying a view as the target object The following example updates rows in a table by specifying a view as the target object. The view definition references multiple tables, however, the UPDATE statement succeeds because it references columns from only one of the underlying tables. For more information, see Modify Data Through a View. Specifying a table alias as the target object The follow example updates rows in the table Production.

Specifying a table variable as the target object The following example updates rows in a table variable. Employee; -- Update columns in the table variable. BusinessEntityID ; GO The previous example assumes that only one sale is recorded for a specified salesperson on a specific date and that updates are current. If more than one sale for a specified salesperson can be recorded on the same day, the example shown does not work correctly.

The example runs without error, but each SalesYTD value is updated with only one sale, regardless of how many sales actually occurred on that wity. In the situation in which more than one sale for a specified salesperson can occur on the same day, all the sales for each sales person must be aggregated together within the UPDATE statement, as shown in the following example: SalesPersonID ; GO Updating Rows in a Remote Table Examples in this section demonstrate how to update rows in a remote target table by using a linked server or a rowset function to reference the remote table. Updating data in a remote table by using a linked server The following example updates a table on a remote server.

The general form to use is: Let suppose that someone has accidentally updated all esqlSalesPerson. City column values to NULL!

The sucking server name destined in the electrical connection is stopped in this site. We do this revealing the following command in our own:.

How can we easily wiith this data without having to retype it in? Knowing that esqlSalesPerson was originally populated by information from Sales Updatinh use knowledge to set up a query that pumps data from vSalesPerson into esqlSalesPerson. City with the matched record. You can run the following to do so and then verify all cities are NULL. In our case the join condition is e. So, once we have the join, the last bit of business to it do the update.

We simply set City to its match counterpart, v. City, and all is well. Suppose statemment SalesLastYear figures dstabase found to be incorrect and needed to be adjusted by five percent. Here are some of the more important ones. Some of the common ones are: Consider a divide by zero error. In this case the inserted is stopped, no rows are updated and an error thrown. The lock is held in place until the update statement completes.

With sql statement Updating database

Since this is an exclusive lock, not other transaction can modify data on this table, until the one which originally placed the lock is completed. The general form to use is: Let suppose that someone has accidentally updated all esqlSalesPerson. City column values to NULL! How can we easily repopulate this data without having to retype it in? Knowing that esqlSalesPerson was originally populated by information from Sales we use knowledge to set up a query that pumps data from vSalesPerson into esqlSalesPerson.

City with the matched record.


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