Updating a result set

06 Jan

If the UPDATE statement affects multiple records, to return the old and new values for each record, use the OUTPUT clause. This can be configured in ODBC data sources or by setting connection attributes or properties.Use caution when specifying the FROM clause to provide the criteria for the update operation. For more information, see SET ANSI_PADDING (Transact-SQL).Common table expressions can also be used with the SELECT, INSERT, DELETE, and CREATE VIEW statements.For more information, see WITH common_table_expression (Transact-SQL). For information about table hints, see Table Hints (Transact-SQL).Specifies the condition to be met for the rows to be updated.The search condition can also be the condition upon which a join is based.This can also be used to change the column to NULL if the column has no default and is defined to allow null values.Compound assignment operator: = Add and assign -= Subtract and assign *= Multiply and assign /= Divide and assign %= Modulo and assign &= Bitwise AND and assign ^= Bitwise XOR and assign |= Bitwise OR and assign Returns updated data or expressions based on it as part of the UPDATE operation.

The CTE result set is derived from a simple query and is referenced by UPDATE statement.Table1', ' U') IS NOT NULL DROP TABLE dbo. Table2', ' U') IS NOT NULL DROP TABLE dbo. Table1 (Col A int NOT NULL, Col B decimal(10,3) NOT NULL); GO CREATE TABLE dbo. If the UPDATE statement could change more than one row while updating both the clustering key and one or more text, ntext, or image columns, the partial update to these columns is executed as a full replacement of the values.Table2 (Col A int PRIMARY KEY NOT NULL, Col B decimal(10,3) NOT NULL); GO INSERT INTO dbo. Important The ntext, text, and image data types will be removed in a future version of Microsoft SQL Server.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. Modifying a text, ntext, or image 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. To replace or modify large blocks of text, ntext, or image data, use WRITETEXT or UPDATETEXT instead of the UPDATE statement.Table1 VALUES(1, 10.0), (1, 20.0); INSERT INTO dbo. Avoid using these data types in new development work, and plan to modify applications that currently use them.Use nvarchar(max), varchar(max), and varbinary(max) instead. ) clause to perform a partial or full update of varchar(max), nvarchar(max), and varbinary(max) data types.There is no limit to the number of predicates that can be included in a search condition.For more information about predicates and search conditions, see Search Condition (Transact-SQL). Table2; USE Adventure Works2012; GO IF OBJECT_ID ('dbo.TOP ( ) Specifies one or more table hints that are allowed for a target table. @Note When referencing the Unicode character data types nchar, nvarchar, and ntext, 'expression' should be prefixed with the capital letter ' N'.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.