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Update 1.create-tag.md #1962

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2 changes: 1 addition & 1 deletion docs-2.0/3.ngql-guide/10.tag-statements/1.create-tag.md
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Expand Up @@ -31,7 +31,7 @@ CREATE TAG [IF NOT EXISTS] <tag_name>
|Parameter|Description|
|:---|:---|
|`IF NOT EXISTS`|Detects if the tag that you want to create exists. If it does not exist, a new one will be created. The tag existence detection here only compares the tag names (excluding properties).|
|`<tag_name>`|1. The tag name must be **unique** in a graph space.<br> 2. Once the tag name is set, it can not be altered.<br> 3. The name of the tag starts with a letter, supports 1 to 4 bytes UTF-8 encoded characters, such as English letters (case-sensitive), digits, and Chinese characters, but does not support special characters except underscores. To use special characters (the period character (.) is excluded) or reserved keywords as identifiers, quote them with backticks. For more information, see [Keywords and reserved words](../../3.ngql-guide/1.nGQL-overview/keywords-and-reserved-words.md).|
|`<tag_name>`|1. The tag name must be **unique** in a graph space.<br> 2. Once the tag name is set, it can not be altered.<br> 3. The name of the tag supports 1 to 4 bytes UTF-8 encoded characters, such as English letters (case-sensitive), digits, and Chinese characters, but does not support special characters except underscores. To use special characters (the period character (.) is excluded) or reserved keywords as identifiers, quote them with backticks. For more information, see [Keywords and reserved words](../../3.ngql-guide/1.nGQL-overview/keywords-and-reserved-words.md).|
|`<prop_name>`|The name of the property. It must be unique for each tag. The rules for permitted property names are the same as those for tag names.|
|`<data_type>`|Shows the data type of each property. For a full description of the property data types, see [Data types](../3.data-types/1.numeric.md) and [Boolean](../3.data-types/2.boolean.md).|
|`NULL \| NOT NULL`|Specifies if the property supports `NULL | NOT NULL`. The default value is `NULL`. `DEFAULT` must be specified if `NOT NULL` is set.|
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