# General

### In this section

* [Concat](https://help.qlik.com/talend/en-US/data-mapper-functions-reference-guide/8.0-R2026-01/concat-function)
* [ConcatFirstPresentValue](https://help.qlik.com/talend/en-US/data-mapper-functions-reference-guide/8.0-R2026-01/concatfirstpresentvalue-function)
* [ConcatLastPresentValue](https://help.qlik.com/talend/en-US/data-mapper-functions-reference-guide/8.0-R2026-01/concatlastpresentvalue-function)
* [Constant](https://help.qlik.com/talend/en-US/data-mapper-functions-reference-guide/8.0-R2026-01/constant-function)
* [ConstantIfBlank](https://help.qlik.com/talend/en-US/data-mapper-functions-reference-guide/8.0-R2026-01/constantifblank-function)
* [MapValues](https://help.qlik.com/talend/en-US/data-mapper-functions-reference-guide/8.0-R2026-01/mapvalues-function)
* [ValueMapping](https://help.qlik.com/talend/en-US/data-mapper-functions-reference-guide/8.0-R2026-01/valuemapping-function)
* [Java](https://help.qlik.com/talend/en-US/data-mapper-functions-reference-guide/8.0-R2026-01/java-function)
* [XPathFunction](https://help.qlik.com/talend/en-US/data-mapper-functions-reference-guide/8.0-R2026-01/xpathfunction-function)
* [DatabaseLookup](https://help.qlik.com/talend/en-US/data-mapper-functions-reference-guide/8.0-R2026-01/databaselookup-function)
* [DatabaseLookupAndUpdate](https://help.qlik.com/talend/en-US/data-mapper-functions-reference-guide/8.0-R2026-01/databaselookupandupdate-function)
* [DatabaseColumn](https://help.qlik.com/talend/en-US/data-mapper-functions-reference-guide/8.0-R2026-01/databasecolumn-function)
* [DatabaseFunction](https://help.qlik.com/talend/en-US/data-mapper-functions-reference-guide/8.0-R2026-01/databasefunction-function)
* [General functions examples](https://help.qlik.com/talend/en-US/data-mapper-functions-reference-guide/8.0-R2026-01/general-functions-examples)