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Update docs for expression defaults #19365

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Jan 6, 2025
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Update docs for expression defaults #19365

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Update data-type-default-values.md
hfxsd Dec 24, 2024
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hfxsd Jan 6, 2025
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Co-authored-by: Grace Cai <qqzczy@126.com>
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@hfxsd @qiancai
hfxsd and qiancai authored Jan 6, 2025
commit a8143f78d384be628db51bb01d2f1db76a2005ab
10 changes: 5 additions & 5 deletions data-type-default-values.md
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Expand Up @@ -46,14 +46,14 @@ TiDB 支持在 `DEFAULT` 子句中指定以下表达式作为字段的默认值
* `DATE_FORMAT(NOW(), '%Y-%m-%d %H.%i.%s')`
* `DATE_FORMAT(NOW(), '%Y-%m-%d %H:%i:%s')`
* `STR_TO_DATE('1980-01-01', '%Y-%m-%d')`
* [`CURRENT_TIMESTAMP()`](/functions-and-operators/date-and-time-functions.md)，[`CURRENT_DATE()`](/functions-and-operators/date-and-time-functions.md)：均使用默认的 fsp (fractional seconds precision)
* [`JSON_OBJECT()`](/functions-and-operators/json-functions.md)，[`JSON_ARRAY()`](/functions-and-operators/json-functions.md), [`JSON_QUOTE()`](/functions-and-operators/json-functions.md)
* [`CURRENT_TIMESTAMP()`](/functions-and-operators/date-and-time-functions.md) 和 [`CURRENT_DATE()`](/functions-and-operators/date-and-time-functions.md)：均使用默认的时间精度(fractional seconds precision, fsp)
* [`JSON_OBJECT()`](/functions-and-operators/json-functions.md)，[`JSON_ARRAY()`](/functions-and-operators/json-functions.md)，[`JSON_QUOTE()`](/functions-and-operators/json-functions.md)
* [`NEXTVAL()`](/functions-and-operators/sequence-functions.md#nextval)
* [`RAND()`](/functions-and-operators/numeric-functions-and-operators.md)
* [`UUID()`](/functions-and-operators/miscellaneous-functions.md#uuid)，[`UUID_TO_BIN()`](/functions-and-operators/miscellaneous-functions.md#uuid_to_bin)
* [`VEC_FROM_TEXT()`](/vector-search-functions-and-operators.md#vec_from_text)

TiDB 支持 `BLOB`、`TEXT` 以及 `JSON` 数据类型分配默认值，但是，你只能使用表达式来设置这些数据类型的默认值，而不能使用字面量。
TiDB 支持为 `BLOB`、`TEXT` 以及 `JSON` 数据类型分配默认值，但是，你只能使用表达式来设置这些数据类型的默认值，而不能使用字面量。

以下是 `BLOB` 的示例：

Expand All @@ -74,7 +74,7 @@ CREATE TABLE t3 (

更多关于如何使用 UUID 的内容，请参考 [UUID 最佳实践](/best-practices/uuid.md)。

以下是使用 JSON 的示例：
以下是使用 `JSON` 的示例：

```sql
CREATE TABLE t4 (
Expand All @@ -83,7 +83,7 @@ CREATE TABLE t4 (
);
```

以下是 JSON 不被允许的示例：
以下是使用 `JSON` 时不被允许的示例：

```sql
CREATE TABLE t5 (
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