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Over time, existing data in the database changes and requires modification. The UPDATE command allows you to change the value of one or more columns in one or more rows of a table. Adding a value to a column that is currently NULL and removing a value from a column are both considered UPDATE statements, not INSERT or DELETE statements. It is important to remember that an INSERT statement adds an entirely new row to the table and that a DELETE statement removes a complete row from the table.
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UPDATE Statement Syntax
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The UPDATE statement full syntax is as follows:
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[ WITH <common_table_expression> [...n] ] UPDATE [ TOP ( expression ) [ PERCENT ] ]
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Modifying Data The INSERT, UPDATE, DELETE, and MERGE Statements
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{ <object> | rowset_function_limited [ WITH ( <Table_Hint_Limited> [ ...n ] ) ] } SET { column_name = { expression | DEFAULT | NULL } | { udt_column_name.{ { property_name = expression | field_name = expression } | method_name ( argument [ ,...n ] ) } } | column_name { .WRITE ( expression , @Offset , @Length ) } | @variable = expression | @variable = column = expression | column_name { += | -= | *= | /= | %= | &= | ^= | |= } expression | @variable { += | -= | *= | /= | %= | &= | ^= | |= } expression | @variable = column { += | -= | *= | /= | %= | &= | ^= | |= } expression } [ ,...n ] [ <OUTPUT Clause> ] [ FROM{ <table_source> } [ ,...n ] ] [ WHERE { <search_condition> | { [ CURRENT OF { { [ GLOBAL ] cursor_name } | cursor_variable_name } ] } } ] [ OPTION ( <query_hint> [ ,...n ] ) ] [ ; ]
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Using the UPDATE Statement
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In its simplest form, the UPDATE statement requires only the name of the object (table or view) being updated and the value to be set. The WHERE clause defines which rows are updated by the command. Because a single UPDATE statement has the ability to update all rows in a table with a single command, programming techniques such as stored procedures and triggers need to be designed to detect and handle multiple-row updates. The following command updates every row in the CurrencyRate table and adds 0.005 to the current end-of-day rate:
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UPDATE Sales.CurrencyRate SET EndOfDayRate = EndOfDayRate + .005;
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Lesson 1: Modifying Data by Using INSERT, UPDATE, and DELETE Statements
If you need to update only specific rows, you must define a WHERE clause to restrict the row set. The following command sets the sales reason name to N/A, for SalesReasonID 10 in the SalesReason table:
UPDATE Sales.SalesReason SET Name = 'N/A' WHERE SalesReasonID = 10;
You can also update the information in a target table based on information in a table joined to the target table by using the FROM clause. For example, the following command increases the unit price of all red products by 5 percent:
UPDATE Sales.SalesOrderDetail SET UnitPrice = UnitPrice * 1.05 FROM SALES.SalesOrderDetail JOIN Production.Product ON SALES.SalesOrderDetail.ProductID = Production.Product.ProductID WHERE Production.Product.Color = 'Red'
Best PraCtiCes
teStinG Data MODiFicatiOnS
Build the logic of an UPDATE or DELETE statement as a SELECT statement and verify its logic before modifying it to run as an UPDATE or DELETE statement. In addition, execute data modifications as part of an explicit transaction to enable a rollback of unintended modifications. Transactions are covered in Lesson 3, Managing Transactions, later in this chapter.
Deleting Data
The DELETE statement allows you to remove from the database rows that are no longer required. With the DELETE statement, entire rows of data are removed from the table. If you want to simply remove a value from a column in a given row, you should use an UPDATE statement.
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