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[Doc] Fix EN CREATE INDEX reference #52085

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Expand Up @@ -16,19 +16,43 @@ This operation requires the ALTER privilege on the target table. You can follow

## Syntax

```sql
CREATE INDEX index_name ON table_name (column [, ...],) [USING BITMAP] [COMMENT 'balabala']
```SQL
CREATE INDEX index_name ON table_name (column_name) [USING BITMAP] [COMMENT'']
```

Note:
## Parameter

1. For the naming conventions of indexes, see [System limits](../../System_limit.md).
2. One column can have only one BITMAP index. If a column already has an index, you cannot create one more index on it.
| **Parameter** | **Required** | **Description** |
| ------------- | -------------- | ---------------------------------------------------------------------------- |
| index_name | Yes | The index name. For naming conventions, see [System Limits](../../System_limit.md). |
| table_name | Yes | The name of the table. |
| column_name | Yes | The name of the column to build index on. One column can have only one BITMAP index. If a column already has an index, you cannot create one more index on it. |
| COMMENT | No | The comment for the index. |

## Examples

1. Create bitmap index for `siteid` on `table1`.
Create a table `sales_records` as follows:

```SQL
CREATE TABLE sales_records
(
record_id int,
seller_id int,
item_id int
)
DISTRIBUTED BY hash(record_id)
PROPERTIES (
"replication_num" = "3"
);
```

Create an index `index` on the `item_id` column of `sales_records`。

```SQL
CREATE INDEX index3 ON sales_records (item_id) USING BITMAP COMMENT '';
```

## Relevant SQLs

```sql
CREATE INDEX index_name ON table1 (siteid) USING BITMAP COMMENT 'balabala';
```
- [SHOW INDEX](SHOW_INDEX.md)
- [DROP INDEX](DROP_INDEX.md)
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