Access SQL Update

Keywords: 	 Access SQL Update

Access SQL Update

Creates an update query that changes values in fields in a specified table based on specified criteria.

Syntax...


UPDATE table
SET newvalue
WHERE criteria;

The UPDATE statement has these parts:

Part		Description
----		-----------
table		The name of the table containing the data 
		you want to modify.
newvalue	An expression that determines the value to be 
		inserted into a particular field in the updated 
		records.
criteria	An expression that determines which records 
		will be updated. Only records that satisfy 
		the expression are updated.

Remarks.....

UPDATE is especially useful when you want to change many records or when the records that you want to change are in multiple tables. You can change several fields at the same time. The following example increases the Order Amount values by 10 percent and the Freight values by 3 percent for shippers in the United Kingdom:


UPDATE Orders
SET OrderAmount = OrderAmount * 1.1,
Freight = Freight * 1.03
WHERE ShipCountry = 'UK';

Important...

UPDATE doesn't generate a result set. Also, after you update records using an update query, you can't undo the operation. If you want to know which records were updated, first examine the results of a select query that uses the same criteria, and then run the update query.
Maintain backup copies of your data at all times. If you update the wrong records, you can retrieve them from your backup copies.

WinBatch code....


retcode = qExecDirect(hstmt, "UPDATE Orders SET OrderAmount = OrderAmount * 1.1, Freight = Freight * 1.03 WHERE ShipCountry = 'UK'")

If (retcode != @qSuccess) && (retcode != @qSuccessInfo)
  ret=qError(hstmt,2)
  Message("MS ACCESS Error", ret)
  Exit
Endif

Article ID:   W14184

Filename:   Access SQL Update.txt

File Created: 2001:01:25:13:54:40

Last Updated: 2001:01:25:13:54:40

Database Search

TechHome

Access SQL Update