[fix][doc] Enable zk when starting standalone in pulsar-sql doc
@@ -17,10 +17,17 @@ To query data in Pulsar with Pulsar SQL, complete the following steps.
```bash
-./bin/pulsar standalone
+PULSAR_STANDALONE_USE_ZOOKEEPER=1 ./bin/pulsar standalone
```
+:::note
+
+Starting the Pulsar standalone cluster from scratch doesn't enable ZooKeeper by default.
+However, the Pulsar SQL depends on ZooKeeper. Therefore, you need to set `PULSAR_STANDALONE_USE_ZOOKEEPER=1` to enable ZooKeeper.
+
+:::
+
2. Start a Pulsar SQL worker.
```bash
