# 7.KSQL

## 3.7.1 Overview

Use the SQL statement to the news data visualization in topic, for SQL queries, and table names field need to use double quotes to mark, example SQL is as follows:

```sql
select * from efak001 where `partition` in (0) limit 10
```

As shown in the following figure:

![query sql](/files/RUHg8sWdtrXfsbP25PIA)

![query log](/files/rcS6FSSWGf0phvpDEqV9)

{% hint style="info" %}
Access to topic message data, depending on the underlying interface record of the earliest and latest offset, the default display up to 5000 records.
{% endhint %}

## 3.7.2 Parse JSONObject Or JSONArrays

Kafka topic datasets like this:

```json
[{"id":123,"name":"smartloli"},{"id":456,"name":"smartloli2"},{"id":789,"name":"smartloli3"}]
```

Then you can use sql query topic like this:

```sql
select JSONS(msg,'name') from topic_name where `partition` in (0) limit 10
```

When Kafka topic datasets like this:

```json
{"id":123,"name":"smartloli001"}
```

Then you can use sql query topic like this:

```sql
select JSON(msg,'name') from topic_name where `partition` in (0) limit 10
```

Using `and` syntax in SQL

```sql
select JSON(msg,'name') from topic_name where `partition` in (0) and JSON(msg,'name') = 'smartloli001' limit 10
```

## 3.7.3 Filter Query \[where ... and]

Kafka topic datasets like this:

```bash
kafka-eagle-01
kafka-eagle-02
kafka-eagle-02
kafka-eagle-03
kafka-eagle-03
```

Then you can use sql query topic like this:

```sql
select * from topic_name where `partition` in (0) and msg = 'kafka-eagle-03' limit 10
```

Using `like` syntax in SQL

```sql
select * from topic_name where `partition` in (0) and msg like 'kafka-eagle%' limit 10
```

Or

```sql
select * from topic_name where `partition` in (0) and msg like '%kafka-eagle%' limit 10
```


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.kafka-eagle.org/3.quickstart/7.ksql.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.