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  • Statistics on composite keys
  • Miscellaneous
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Stored procedures
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.
Example
// Réalisation de statistiques sur la clé NomCli du fichier de données Client
RésultatStat = HStatNbRecRange(Client, NomCli, "Dupont", "Durant")
Syntax
<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 management function (function starting with "H").
<Key item>: Optional character string
Name of key item used to perform the statistical calculation. If this name is not specified, function HStatNbRecRange will handle the last field used by the last HFSQL maintenance function (function beginning with the letter H).
<Lower bound>: Type of key item
Lower value of interval.
<Upper bound>: Type of key item
Upper value of interval.
Remarks

Statistics on composite keys

The following syntax allows you to calculate statistics on a composite key:
HStatNbEnrIntervalle(<Fichier de données>, <Nom de la clé composée>,
[<Borne minimale du premier élément de la clé composée>,
<Borne minimale du second élément de la clé composée>],
[<Borne maximale du premier élément de la clé composée>,
<Borne maximale du second élément de la clé composée>, ...])

Example:
HStatNbRecRange(Client, Nom_Prenom, ["Blanc", "Alice"], ["Moulin", "Françoise"])

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.
Component: wd270hf.dll
Minimum version required
  • Version 9
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