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Xin giúp đỡ hàm DCount
- Xin giúp đỡ hàm DCount
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Xin giúp đỡ hàm DCount
congtukinhloai > 21-02-13, 05:32 PM
Cho biết có bao nhiêu hóa đơn xuất hiện trong cùng một kho, thể hiện
thông tin: MAKHO, TONGSOHD. Trong đó MAKHO được cho trước từ KH01 đếnKH10.
Mình nhập công thức như sau DCount([“]*[”],[”HOADON”],[”MAKHO]=[’KH01’”],[‘KH02’”],[‘KH03’”],[‘KH04’”],[‘KH05’”],[‘KH06’”],[‘KH07’”],[‘KH08’”],[‘KH09’”],[‘KH10’”])
Nhưng báo lối biểu thức mà bạn nhập vào có một chức năng có chứa sai số đối số -
RE: Xin giúp đỡ hàm DCount
Xuân Thanh > 21-02-13, 05:48 PM
Đây là Help, nhấn F1 sẽ thấy :
Mã:DCount Function
See AlsoApplies ToExampleSpecificsYou can use the DCount function to determine the number of records that are in a specified set of records (a domain). Use the DCount function in Visual Basic, a macro, a query expression, or a calculated control.
For example, you could use the DCount function in a module to return the number of records in an Orders table that correspond to orders placed on a particular date.
DCount(expr, domain, [criteria])
The DCount function has the following arguments.
Argument Description
expr An expression that identifies the field for which you want to count records. 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 DCount 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 DCount function evaluates expr against the entire domain. Any field that is included in criteria must also be a field in domain; otherwise the DCount function returns a Null.
Remarks
Use the DCount function to count the number of records in a domain when you don't need to know their particular values. Although the expr argument can perform a calculation on a field, the DCount function simply tallies the number of records. The value of any calculation performed by expr is unavailable.
Use the DCount function in a calculated control when you need to specify criteria to restrict the range of data on which the function is performed. For example, to display the number of orders to be shipped to California, set the ControlSource property of a text box to the following expression:
=DCount("[OrderID]", "Orders", "[ShipRegion] = 'CA'")
If you simply want to count all records in domain without specifying any restrictions, use the Count function.
Tip
The Count function has been optimized to speed counting of records in queries. Use the Count function in a query expression instead of the DCount function, and set optional criteria to enforce any restrictions on the results. Use the DCount function when you must count records in a domain from within a code module or macro, or in a calculated control.
You can use the DCount function to count the number of records containing a particular field that isn't in the record source on which your form or report is based. For example, you could display the number of orders in the Orders table in a calculated control on a form based on the Products table.
The DCount function doesn't count records that contain Null values in the field referenced by expr unless expr is the asterisk (*) wildcard character. If you use an asterisk, the DCount function calculates the total number of records, including those that contain Null fields. The following example calculates the number of records in an Orders table.
intX = DCount("*", "Orders")
If domain is a table with a primary key, you can also count the total number of records by setting expr to the primary key field, since there will never be a Null in the primary key field.
If expr identifies multiple fields, separate the field names with a concatenation operator, either an ampersand (&) or the addition operator (+). If you use an ampersand to separate the fields, the DCount function returns the number of records containing data in any of the listed fields. If you use the addition operator, the DCount function returns only the number of records containing data in all of the listed fields. The following example demonstrates the effects of each operator when used with a field that contains data in all records (ShipName) and a field that contains no data (ShipRegion).
intW = DCount("[ShipName]", "Orders")
intX = DCount("[ShipRegion]", "Orders")
intY = DCount("[ShipName] + [ShipRegion]", "Orders")
intZ = DCount("[ShipName] & [ShipRegion]", "Orders")
Note The ampersand is the preferred operator for performing string concatenation. You should avoid using the addition operator for anything other than numeric addition, unless you specifically wish to propagate Nulls through an expression.
Unsaved changes to records in domain aren't included when you use this function. If you want the DCount function to be based on the changed values, you must first save the changes by clicking Save Record on the Records menu, moving the focus to another record, or by using the Update method.
Tất thảy đều có trong Help đó. Đọc lại cái cơ bản về các hàm nhé
Thân
Ngoài ra bạn cũng có thể tham khảo tại đây http://thuthuataccess.com/forum/thread-3265.html
Nhớ tìm kiếm trươc khi hỏi
Thân mến -
RE: Xin giúp đỡ hàm DCount
khải nguyên > 21-02-13, 09:35 PM
Hàm DCount.. để đếm các số phiếu , số dòng , số hóa đơn ... v.v.v cũng như đếm số lần xuất trong ngày , đếm xem có bao nhiêu Hàng hóa nhập trong ngày , đếm xem có ba nhiêu Nhân Viên trong công ty ..v.v.vv.
và đây là hàm ....." Pó tay .com " với Code ....Là " Hàm Răng " của tui ......
Khải nguyên Sorry ! -
RE: Xin giúp đỡ hàm DCount
cpucloi > 24-02-13, 02:53 PM
To giai thich mot chut:
Ham Dcount de dem so mau tin thoa man mot dk nao do.
Cong thuc Dcount("ten filed","ten bang","dieu kien")
-------> cong thuc tren cua ban ko dung
1. Ban khong the su dung * thay the cho "ten filed"
2. Dieu kien cua ban dang muon su dung ham or (hay xem lai cach viet ham or)
