|
|
|
|
|
|
|
|
|
|
- Statistics on composite keys
- Miscellaneous
HStatNbRecRange (Function)
  Disponible solo con estos tipos de conexión
Returns an estimate regarding the number of entries for a given key item in a given interval of values. This estimate is deduced from the information obtained during the last statistical calculation.
ResStat = HStatNbRecRange(Customer, CustName, "Clark", "Smith")
Sintaxis
<Result> = HStatNbRecRange([<Data file> [, <Key item>, ]] <Lower bound> , <Upper bound>)
<Result>: Integer Number of entries found for the specified item in the requested interval.
Corresponds to the hInvalidRecNum constant if:- the statistics have never been calculated for the specified item.
- the statistics are not supported by the specified type of item. HFSQL allows you to perform statistical calculations on key items only.
<Data file>: Optional character string Name of the data file used. If this name is not specified, HStatNbRecRange will use the last data file used by the last HFSQL function (function starting with "H"). <Key item>: Optional character string Name of the key item used to calculate statistics. If this name is not specified, HStatNbRecRange will use the last item used by the last HFSQL management function (function starting with "H"). <Lower bound>: Type of key item Lower value of interval. <Upper bound>: Type of key item Upper value of interval. Observaciones Statistics on composite keys To perform a statistical calculation on a composite key, use the following syntax:
HStatNbRecRange(<Data file>, <Name of composite key>),
[<Lower bound of first element of composite key>,
<Lower bound of second element of composite key>],
[<Upper bound of first element of composite key>,
<Upper bound of second element of composite key>, ...]) Example:
HStatNbRecRange(Customer, LastName_FirstName, ["Black", "Alicia"], ["Morgan","Vince"])
Miscellaneous - The statistics can be updated by HIndex and HStatCalculate.
- In the HFSQL Classic data files, the statistical calculations can only be performed on key items.
Esta página también está disponible para…
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|