[[["易于理解","easyToUnderstand","thumb-up"],["解决了我的问题","solvedMyProblem","thumb-up"],["其他","otherUp","thumb-up"]],[["很难理解","hardToUnderstand","thumb-down"],["信息或示例代码不正确","incorrectInformationOrSampleCode","thumb-down"],["没有我需要的信息/示例","missingTheInformationSamplesINeed","thumb-down"],["翻译问题","translationIssue","thumb-down"],["其他","otherDown","thumb-down"]],["最后更新时间 (UTC):2025-08-25。"],[],[],null,["# Data types\n\nA field's *data type* specifies the kind of values the field can contain and determines how that field's data appears in your reports, as well as which operations are allowed for the field and which are not allowed. For example, you can't apply an arithmetic function to a **Text** type field, or use a **Number** type field as the date range dimension in a report.\n\nThe following table shows the supported field types, along with the kind of data expected as input, and examples of how that data might look in your reports.\n\nTo change a field's data type, use the **Type** drop-down menu in the data source edit page. If the [field editing in reports](/looker/docs/studio/edit-fields-in-your-reports) option is enabled for the data source, you can also change a field's data type directly in reports based on this data source.\n\nIf the [field editing in reports](/looker/docs/studio/edit-fields-in-your-reports) option is enabled for the data source, you can also [apply custom value formatting](/looker/docs/studio/format-fields-in-reports) to **Number** and **Date \\& Time** type fields, without sending additional SQL queries to the database."]]