55 lines
1.3 KiB
Markdown
55 lines
1.3 KiB
Markdown
---
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{
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"title": "length",
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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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# length
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## description
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### Syntax
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`INT length(VARCHAR str)`
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返回字符串的长度，对于多字节字符，返回的字符数。比如5个两字节宽度字，返回的长度是10。
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## example
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```
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mysql> select length("abc");
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+---------------+
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| length('abc') |
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+---------------+
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| 3 |
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+---------------+
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mysql> select length("中国");
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+------------------+
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| length('中国') |
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+------------------+
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| 6 |
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+------------------+
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```
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##keyword
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LENGTH
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