# Fonctions relatives aux types de données

Les fonctions suivantes peuvent être utilisées pour vérifier des valeurs et des types de données, ainsi que pour convertir une valeur en un autre type de données.

### Dans cette section

* [databaseLookup](https://help.qlik.com/talend/fr-FR/data-shaping-language-reference-guide/8.0/databaselookup-function)
* [databaseLookupAndUpdate](https://help.qlik.com/talend/fr-FR/data-shaping-language-reference-guide/8.0/databaselookupandupdate-function)
* [databaseUpdateAndLookup](https://help.qlik.com/talend/fr-FR/data-shaping-language-reference-guide/8.0/databaseupdateandlookup-function)
* [formatNumber](https://help.qlik.com/talend/fr-FR/data-shaping-language-reference-guide/8.0/formatnumber-function)
* [hasValue](https://help.qlik.com/talend/fr-FR/data-shaping-language-reference-guide/8.0/hasvalue-function)
* [isEmpty](https://help.qlik.com/talend/fr-FR/data-shaping-language-reference-guide/8.0/isempty-function)
* [isNull](https://help.qlik.com/talend/fr-FR/data-shaping-language-reference-guide/8.0/isnull-function)
* [isBoolean](https://help.qlik.com/talend/fr-FR/data-shaping-language-reference-guide/8.0/isboolean-function)
* [isBytes](https://help.qlik.com/talend/fr-FR/data-shaping-language-reference-guide/8.0/isbytes-function)
* [isCastable](https://help.qlik.com/talend/fr-FR/data-shaping-language-reference-guide/8.0/iscastable-function)
* [isDate](https://help.qlik.com/talend/fr-FR/data-shaping-language-reference-guide/8.0/isdate-function)
* [isDateTime](https://help.qlik.com/talend/fr-FR/data-shaping-language-reference-guide/8.0/isdatetime-function)
* [isDecimal](https://help.qlik.com/talend/fr-FR/data-shaping-language-reference-guide/8.0/isdecimal-function)
* [isDouble](https://help.qlik.com/talend/fr-FR/data-shaping-language-reference-guide/8.0/isdouble-function)
* [isFloat](https://help.qlik.com/talend/fr-FR/data-shaping-language-reference-guide/8.0/isfloat-function)
* [isInteger](https://help.qlik.com/talend/fr-FR/data-shaping-language-reference-guide/8.0/isinteger-function)
* [isLong](https://help.qlik.com/talend/fr-FR/data-shaping-language-reference-guide/8.0/islong-function)
* [isNumber](https://help.qlik.com/talend/fr-FR/data-shaping-language-reference-guide/8.0/isnumber-function)
* [isString](https://help.qlik.com/talend/fr-FR/data-shaping-language-reference-guide/8.0/isstring-function)
* [isTime](https://help.qlik.com/talend/fr-FR/data-shaping-language-reference-guide/8.0/istime-function)
* [toBoolean](https://help.qlik.com/talend/fr-FR/data-shaping-language-reference-guide/8.0/toboolean-function)
* [toBytes](https://help.qlik.com/talend/fr-FR/data-shaping-language-reference-guide/8.0/tobytes-function)
* [toDate](https://help.qlik.com/talend/fr-FR/data-shaping-language-reference-guide/8.0/todate-function)
* [toDateTime](https://help.qlik.com/talend/fr-FR/data-shaping-language-reference-guide/8.0/todatetime-function)
* [toDecimal](https://help.qlik.com/talend/fr-FR/data-shaping-language-reference-guide/8.0/todecimal-function)
* [toDouble](https://help.qlik.com/talend/fr-FR/data-shaping-language-reference-guide/8.0/todouble-function)
* [toFloat](https://help.qlik.com/talend/fr-FR/data-shaping-language-reference-guide/8.0/tofloat-function)
* [toInteger](https://help.qlik.com/talend/fr-FR/data-shaping-language-reference-guide/8.0/tointeger-function)
* [toLong](https://help.qlik.com/talend/fr-FR/data-shaping-language-reference-guide/8.0/tolong-function)
* [toString](https://help.qlik.com/talend/fr-FR/data-shaping-language-reference-guide/8.0/tostring-function)
* [toTime](https://help.qlik.com/talend/fr-FR/data-shaping-language-reference-guide/8.0/totime-function)