Updating fields in sql

10-Aug-2016 09:32 by 6 Comments

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A positioned update using a WHERE CURRENT OF clause updates the single row at the current position of the cursor. For best performance, we recommend that data be inserted or updated in chunk sizes that are multiples of 8040 bytes. WRITE clause is referenced in an OUTPUT clause, the complete value of the column, either the before image in deleted. Sales Person ID); GO The following example updates rows in a table by specifying a view as the target object. Business Entity ID); GO The previous example assumes that only one sale is recorded for a specified salesperson on a specific date and that updates are current. Document WHERE Title = N'Crank Arm and Tire Maintenance'; GO -- Replacing temporary data with the correct data. WRITE(N'Carefully inspect and maintain the tires and crank arms.',0, NULL) WHERE Title = N'Crank Arm and Tire Maintenance'; GO SELECT Document Summary FROM Production. WRITE (N' Appending data to the end of the column.', NULL, 0) WHERE Title = N'Crank Arm and Tire Maintenance'; GO SELECT Document Summary FROM Production. WRITE (NULL, 56, 0) WHERE Title = N'Crank Arm and Tire Maintenance'; GO SELECT Document Summary FROM Production. WRITE ('',9, 12) WHERE Title = N'Crank Arm and Tire Maintenance'; GO SELECT Document Summary FROM Production.

UPDATE statements are allowed in the body of user-defined functions only if the table being modified is a table variable. These results can be returned to the processing application for use in such things as confirmation messages, archiving, and other such application requirements. Modified Date INTO @My Table Var; --Display the result set of the table variable.

Use caution when specifying the FROM clause to provide the criteria for the update operation. Table2 (Col A int PRIMARY KEY NOT NULL, Col B decimal(10,3) NOT NULL); GO INSERT INTO dbo. When a FILESTREAM field is set to NULL, the BLOB data associated with the field is deleted. WRITE(), to perform partial updates to FILESTREAM data. Business Entity ID) ; OPEN complex_cursor; FETCH FROM complex_cursor; UPDATE Human Resources. DECLARE @My Table Var table( Emp ID int NOT NULL, New Vacation Hours int, Modified Date datetime); -- Populate the table variable with employee ID values from Human Resources. INSERT INTO @My Table Var (Emp ID) SELECT Business Entity ID FROM Human Resources. SELECT Emp ID, New Vacation Hours, Modified Date FROM @My Table Var ORDER BY Emp ID; GO USE Adventure Works2012; GO UPDATE Sales. 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 USE Adventure Works2012; GO UPDATE Sales. The expression supplying the value must be implicitly convertible to the type of the property.

The results of an UPDATE statement are undefined if the statement includes a FROM clause that is not specified in such a way that only one value is available for each column occurrence that is updated, that is if the UPDATE statement is not deterministic. Table1 VALUES(1, 10.0), (1, 20.0); INSERT INTO dbo. For more information, see If an update to a row violates a constraint or rule, violates the NULL setting for the column, or the new value is an incompatible data type, the statement is canceled, an error is returned, and no records are updated. Component Level = 0; (SELECT MAX(Rate Change Date) FROM Human Resources. Employee Pay History SET Pay Frequency = 2 WHERE CURRENT OF complex_cursor; CLOSE complex_cursor; DEALLOCATE complex_cursor; GO The following example uses a subquery in the SET clause to determine the value that is used to update the column. Sales Person SET Sales YTD = Sales YTD Sub Total FROM Sales. Sales Person SET Sales YTD = Sales YTD (SELECT SUM(so. The following example modifies the value of property Because the SQL Server query optimizer typically selects the best execution plan for a query, we recommend that hints be used only as a last resort by experienced developers and database administrators. This hint instructs the query optimizer to use a particular value for a local variable when the query is compiled and optimized.

When an INSTEAD OF trigger is defined on UPDATE actions against a table, the trigger is running instead of the UPDATE statement. USE Adventure Works2012; GO DECLARE @My Table Var table( Emp ID int NOT NULL, Old Vacation Hours int, New Vacation Hours int, Modified Date datetime); UPDATE TOP (10) Human Resources. SELECT Emp ID, Old Vacation Hours, New Vacation Hours, Modified Date FROM @My Table Var; GO --Display the result set of the table.

Earlier versions of SQL Server only support AFTER triggers defined on UPDATE and other data modification statements. Employee SET Vacation Hours = Vacation Hours * 1.25, Modified Date = GETDATE() OUTPUT inserted. SELECT TOP (10) Business Entity ID, Vacation Hours, Modified Date FROM Human Resources.

Any call to OPENDATASOURCE, OPENQUERY, or OPENROWSET in the FROM clause is evaluated separately and independently from any call to these functions used as the target of the update, even if identical arguments are supplied to the two calls. This can be configured in ODBC data sources or by setting connection attributes or properties.

In particular, filter or join conditions applied on the result of one of those calls have no effect on the results of the other. For more information, see column with UPDATE initializes the column, assigns a valid text pointer to it, and allocates at least one data page, unless the column is being updated with NULL.For example, in the UPDATE statement in the following script, both rows in USE Adventure Works2012; GO IF OBJECT_ID ('dbo. When an UPDATE statement encounters an arithmetic error (overflow, divide by zero, or a domain error) during expression evaluation, the update is not performed. The subquery must return only a scalar value (that is, a single value per row). The value is used only during query optimization, and not during query execution.The rest of the batch is not executed, and an error message is returned. The example modifies the USE Adventure Works2012; GO UPDATE Sales. USE Adventure Works2012; GO CREATE PROCEDURE Product Update @Product nvarchar(25) AS SET NOCOUNT ON; UPDATE Production.Common table expressions can also be used with the SELECT, INSERT, DELETE, and CREATE VIEW statements. For information about table hints, see , 'expression' should be prefixed with the capital letter 'N'.For more information, see Specifies one or more table hints that are allowed for a target table. If 'N' is not specified, SQL Server converts the string to the code page that corresponds to the default collation of the database or column.This can also be used to change the column to NULL if the column has no default and is defined to allow null values.

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