1# Types 2 3> **NOTE** 4> 5> The initial APIs of this module are supported since API version 9. Newly added APIs will be marked with a superscript to indicate their earliest API version. 6 7## Assets<sup>10+</sup> 8 9type Assets = Asset[] 10 11Indicates an [Asset](arkts-apis-data-relationalStore-i.md#asset10) array. 12 13**System capability**: SystemCapability.DistributedDataManager.RelationalStore.Core 14 15| Type | Description | 16| ------- | -------------------- | 17| [Asset](arkts-apis-data-relationalStore-i.md#asset10)[] | Array of assets. | 18 19## ValueType 20 21type ValueType = null | number | string | boolean | Uint8Array | Asset | Assets | Float32Array | bigint 22 23Defines the types of the value in a KV pair. The type varies with the parameter function. 24 25**System capability**: SystemCapability.DistributedDataManager.RelationalStore.Core 26 27| Type | Description | 28| ------- | -------------------- | 29| null<sup>10+</sup> | Null. | 30| number | Number. | 31| string | String. | 32| boolean | Boolean.| 33| Uint8Array<sup>10+</sup> | Uint8 array. | 34| Asset<sup>10+</sup> | [Asset](arkts-apis-data-relationalStore-i.md#asset10).<br>If the value type is Asset, the type in the SQL statement for creating a table must be ASSET.| 35| Assets<sup>10+</sup> | [Assets](#assets10).<br>If the value type is Assets, the type in the SQL statement for creating a table must be ASSETS.| 36| Float32Array<sup>12+</sup> | Array of 32-bit floating-point numbers.<br>If the field type is Float32Array, the type in the SQL statement for creating a table must be floatvector(128).| 37| bigint<sup>12+</sup> | Integer of any length.<br>If the value type is bigint, the type in the SQL statement for creating a table must be **UNLIMITED INT**. For details, see [Persisting RDB Store Data](../../database/data-persistence-by-rdb-store.md).<br>**NOTE**<br>The bigint type does not support value comparison and cannot be used with the following predicates: **between**, **notBetween**, **greaterThan**, **lessThan**, **greaterThanOrEqualTo**, **lessThanOrEqualTo**, **orderByAsc**, and **orderByDesc**<br>To write a value of bigint type, use **BigInt()** or add **n** to the end of the value, for example,'let data = BigInt(1234)' or 'let data = 1234n'.<br>If data of the number type is written to a bigint field, the type of the return value obtained (queried) is number but not bigint.| 38 39## ValuesBucket 40 41type ValuesBucket = Record<string, ValueType> 42 43Defines the data in the form of a KV pair. **ValuesBucket** cannot be passed across threads using Sendable. 44 45**System capability**: SystemCapability.DistributedDataManager.RelationalStore.Core 46 47| Type | Description | 48| ---------------- | ---------------------------- | 49| Record<string, [ValueType](#valuetype)> | Types of the key and value in a KV pair. The key type is string, and the value type is [ValueType](#valuetype).| 50 51## PRIKeyType<sup>10+</sup> 52 53type PRIKeyType = number | string 54 55Enumerates the types of the primary key in a row of a database table. 56 57**System capability**: SystemCapability.DistributedDataManager.RelationalStore.Core 58 59| Type | Description | 60| ---------------- | ---------------------------------- | 61| number | The primary key is a number.| 62| string | The primary key is a string.| 63 64## UTCTime<sup>10+</sup> 65 66type UTCTime = Date 67 68Represents the data type of the UTC time. 69 70**System capability**: SystemCapability.DistributedDataManager.RelationalStore.Core 71 72| Type| Description | 73| ---- | --------------- | 74| Date | UTC time.| 75 76## ModifyTime<sup>10+</sup> 77 78type ModifyTime = Map<PRIKeyType, UTCTime> 79 80Represents the data type of the primary key and modification time of a database table. 81 82**System capability**: SystemCapability.DistributedDataManager.RelationalStore.Core 83 84| Type | Description | 85| ------------------------------------------------------- | ------------------------------------------------------------ | 86| Map<[PRIKeyType](#prikeytype10), [UTCTime](#utctime10)> | The key is the primary key of a row in the database table, and the value is the last modification time of the row in UTC format.| 87