> For the complete documentation index, see [llms.txt](https://litedb.gitbook.io/litedb-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://litedb.gitbook.io/litedb-docs/sql/dml/delete.md).

# DELETE

DELETE 语句用于删除集合中的记录。

执行前需要先 [USE](/litedb-docs/sql/ddl/database/use.md) 切换到目标数据库。

## 语法

```ebnf
delete_statement ::=
    DELETE FROM collection_name
    [ WHERE expression ]

collection_name ::= identifier
```

## 参数

| 参数                 | 说明                      |
| ------------------ | ----------------------- |
| `collection_name`  | 目标集合名称                  |
| `WHERE expression` | 可选过滤条件，结果类型须为 `BOOLEAN` |

## 说明

* 省略 `WHERE` 时，删除集合中的**全部**记录。
* 当前不支持 `LIMIT`、`ORDER BY` 或 `RETURNING`。
* 删除成功后会同步维护相关标量索引与向量索引。

## 示例

```sql
DELETE FROM users WHERE age < 18;

DELETE FROM users WHERE id = 1;

-- 无 WHERE：删除全部行
DELETE FROM users;
```


---

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