More Updating A Field In Access videos. In the destination table, double-click the fields that you want to update. Each field appears in the Field row in the query design grid. If you use the sample tables, you add all fields except the Customer ID field. Notice that the name of the destination table appears in the Table row of the design grid. Updating Records in Microsoft Access with an Update Query: A situation may arise where we need to update many records in a database table when certain information. I have an Sql update statement that I am using that updates the data from a record chosen by the user from a list box lstDelFrom. This is working for all the text fields & updates fine. Once I add in one of the fields that is a Date field I cannot get the update to work. Ie) this line '[delegation].[on] = #' & Nz(rst.Fields(9).Value, ') & '#,' & _ Could someone assist me with the correct syntax to use. I also need to consider that the field may be null if nothing was entered in against the date field. Here is my code so far. ![]() ![]() The field I am trying to update is called [delegation].[on] It is defined as a short date in the delegation table. I palaced some answers/examples to your questions. I hope this can help you. They are copied from other forums. /en-us/library/aa211470(office.11).aspx /forum/thread763794.html 1) A date data type is numeric, and you are converting the nulls to ' ' (spaces), which is text. So try converting the nulls to zero and see if it helps: '[delegation].[on] = #' & Nz(rst.Fields(9).Value, 0) & '#,' & _ 2) DAvg Function [Access 2003 VBA Language Reference] You can use the DAvg function to calculate the average of a set of values in a specified set of records (a domain). Use the DAvg function in Visual Basic code or in a macro, in a query expression, or in a calculated control. For example, you could use the DAvg function in the criteria row of a select query on freight cost to restrict the results to those records where the freight cost exceeds the average. Or you could use an expression including the DAvg function in a calculated control and display the average value of previous orders next to the value of a new order. DAvg(expr, domain, [criteria]) The DAvg function has the following arguments. Argument Description expr An expression that identifies the field containing the numeric data you want to average. It can be a string expression identifying a field in a table or query, or it can be an expression that performs a calculation on data in that field. In expr, you can include the name of a field in a table, a control on a form, a constant, or a function. If expr includes a function, it can be either built-in or user-defined, but not another domain aggregate or SQL aggregate function. Domain A string expression identifying the set of records that constitutes the domain. It can be a table name or a query name for a query that does not require a parameter. Criteria An optional string expression used to restrict the range of data on which the DAvg function is performed. For example, criteria is often equivalent to the WHERE clause in an SQL expression, without the word WHERE. If criteria is omitted, the DAvg function evaluates expr against the entire domain. Any field that is included in criteria must also be a field in domain; otherwise the DAvg function returns a Null. Remarks Records containing Null values aren't included in the calculation of the average. Whether you use the DAvg function in a macro or module, in a query expression, or in a calculated control, you must construct the criteria argument carefully to ensure that it will be evaluated correctly. You can use the DAvg function to specify criteria in the Criteria row of a query. For example, suppose you want to view a list of all products ordered in quantities above the average order quantity. You could create a query on the Orders, Order Details, and Products tables, and include the Product Name field and the Quantity field, with the following expression in the Criteria row beneath the Quantity field: >DAvg('[Quantity]', 'Orders') You can also use the DAvg function within a calculated field expression in a query, or in the Update To row of an update query. Note You can use either the DAvg or Avg function in a calculated field expression in a totals query. If you use the DAvg function, values are averaged before the data is grouped. If you use the Avg function, the data is grouped before values in the field expression are averaged. Use the DAvg function in a calculated control when you need to specify criteria to restrict the range of data on which the DAvg function is performed.
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