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[doc](function)support isnull and isnotnull function
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‎docs/sql-manual/sql-functions/scalar-functions/conditional-functions/isnotnull.md

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---
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{
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"title": "ISNOTNULL",
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"language": "en"
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}
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---
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<!--
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Licensed to the Apache Software Foundation (ASF) under one
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or more contributor license agreements. See the NOTICE file
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distributed with this work for additional information
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regarding copyright ownership. The ASF licenses this file
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to you under the Apache License, Version 2.0 (the
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"License"); you may not use this file except in compliance
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with the License. You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing,
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software distributed under the License is distributed on an
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"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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KIND, either express or implied. See the License for the
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specific language governing permissions and limitations
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under the License.
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-->
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## Description
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Returns `bool` if the expression is not `NULL`.
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## Syntax
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```sql
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ISNOTNULL(<expr>)
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```
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## Parameters
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| Parameter | Description |
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| --------- | --------------------------------------- |
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| `<expr>` | The expression to check for not `NULL`. |
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| | |
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## Return Value
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- Returns `bool` if the expression is not `NULL`.
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## Examples
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```sql
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SELECT ISNOTNULL(NULL);
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```
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```text
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+-----------------+
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| ISNOTNULL(NULL) |
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+-----------------+
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| 0 |
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+-----------------+
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```
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```sql
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SELECT NULL ISNOTNULL;
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```
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```text
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+----------------+
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| NULL ISNOTNULL |
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+----------------+
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| 0 |
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+----------------+
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```

‎docs/sql-manual/sql-functions/scalar-functions/conditional-functions/isnull.md

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---
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{
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"title": "ISNULL",
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"language": "en"
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}
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---
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<!--
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Licensed to the Apache Software Foundation (ASF) under one
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or more contributor license agreements. See the NOTICE file
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distributed with this work for additional information
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regarding copyright ownership. The ASF licenses this file
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to you under the Apache License, Version 2.0 (the
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"License"); you may not use this file except in compliance
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with the License. You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing,
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software distributed under the License is distributed on an
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"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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KIND, either express or implied. See the License for the
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specific language governing permissions and limitations
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under the License.
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-->
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## Description
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Returns `bool` if the expression is `NULL`.
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## Syntax
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```sql
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ISNULL(<expr>)
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```
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## Parameters
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| Parameter | Description |
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| --------- | ----------------------------------- |
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| `<expr>` | The expression to check for `NULL`. |
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| | |
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## Return Value
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- Returns `bool` if the expression is `NULL`.
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## Examples
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```sql
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SELECT ISNULL(NULL);
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```
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```text
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+--------------+
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| ISNULL(NULL) |
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+--------------+
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| 1 |
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+--------------+
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```
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```sql
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SELECT NULL ISNULL;
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```
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```text
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+-------------+
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| NULL ISNULL |
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+-------------+
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| 1 |
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+-------------+
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```

‎i18n/zh-CN/docusaurus-plugin-content-docs/current/sql-manual/sql-functions/scalar-functions/conditional-functions/isnotnull.md

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---
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{
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"title": "ISNOTNULL",
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"language": "zh-CN"
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}
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---
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<!--
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Licensed to the Apache Software Foundation (ASF) under one
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or more contributor license agreements. See the NOTICE file
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distributed with this work for additional information
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regarding copyright ownership. The ASF licenses this file
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to you under the Apache License, Version 2.0 (the
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"License"); you may not use this file except in compliance
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with the License. You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing,
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software distributed under the License is distributed on an
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"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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KIND, either express or implied. See the License for the
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specific language governing permissions and limitations
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under the License.
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-->
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## 描述
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返回表达式是否不为空的`bool`值。
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## 语法
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```sql
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ISNOTNULL(<expr>)
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```
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## 参数
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| 参数 | 描述 |
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| -------- | ---------------------------------- |
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| `<expr>` | 需要判断是否不为 `NULL` 的表达式。 |
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| | |
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## 返回值
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- 返回表达式是否不为空的`bool`值。
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## 举例
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```sql
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SELECT ISNOTNULL(NULL);
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```
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```text
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+-----------------+
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| ISNOTNULL(NULL) |
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+-----------------+
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| 0 |
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+-----------------+
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```
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```sql
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SELECT NULL ISNOTNULL;
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```
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```text
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+----------------+
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| NULL ISNOTNULL |
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+----------------+
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| 0 |
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+----------------+
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```

‎i18n/zh-CN/docusaurus-plugin-content-docs/current/sql-manual/sql-functions/scalar-functions/conditional-functions/isnull.md

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---
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{
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"title": "ISNULL",
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"language": "zh-CN"
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}
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---
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<!--
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Licensed to the Apache Software Foundation (ASF) under one
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or more contributor license agreements. See the NOTICE file
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distributed with this work for additional information
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regarding copyright ownership. The ASF licenses this file
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to you under the Apache License, Version 2.0 (the
15+
"License"); you may not use this file except in compliance
16+
with the License. You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing,
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software distributed under the License is distributed on an
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"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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KIND, either express or implied. See the License for the
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specific language governing permissions and limitations
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under the License.
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-->
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## 描述
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返回表达式是否为空的`bool`值。
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## 语法
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```sql
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ISNULL(<expr>)
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```
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## 参数
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| 参数 | 描述 |
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| -------- | -------------------------------- |
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| `<expr>` | 需要判断是否为 `NULL` 的表达式。 |
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| | |
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## 返回值
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- 返回表达式是否为空的`bool`值。
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## 举例
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```sql
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SELECT ISNULL(NULL);
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```
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```text
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+--------------+
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| ISNULL(NULL) |
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+--------------+
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| 1 |
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+--------------+
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```
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```sql
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SELECT NULL ISNULL;
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```
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```text
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+-------------+
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| NULL ISNULL |
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+-------------+
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| 1 |
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+-------------+
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```

‎sidebars.json

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"sql-manual/sql-functions/scalar-functions/conditional-functions/not-null-or-empty",
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"sql-manual/sql-functions/scalar-functions/conditional-functions/ifnull",
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"sql-manual/sql-functions/scalar-functions/conditional-functions/nullif",
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"sql-manual/sql-functions/scalar-functions/conditional-functions/isnull",
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"sql-manual/sql-functions/scalar-functions/conditional-functions/isnotnull",
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"sql-manual/sql-functions/scalar-functions/conditional-functions/greatest",
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"sql-manual/sql-functions/scalar-functions/conditional-functions/least"
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]
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]
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}
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]
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}
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}

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