RaigorJiang commented on code in PR #19960:
URL: https://github.com/apache/shardingsphere/pull/19960#discussion_r939820781
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docs/document/content/user-manual/shardingsphere-proxy/distsql/_index.en.md:
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@@ -4,4 +4,32 @@ weight = 3
chapter = true
+++
-This chapter will introduce the detailed syntax of
[DistSQL](/en/concepts/distsql/).
+This chapter will introduce the detailed syntax of
[DistSQL](/en/overview/distsql/).
+
+## Syntax Rule
+
+In DistSQL statement, except for keywords, the input format of other elements
shall conform to the following rules.
+
+### Identifier
+
+1. The identifier represents an object in the SQL statement, including:
+- database name
+- table name
+- column name
+- index name
+- resource name
+- rule name
+- algorithm name
+
+1. The allowed characters in the identifier are: [`A-Z, A-Z, 0-9, _`]
(letters, numbers, underscores) and should start with a letter.
+
+1. When keywords or special characters appear in the identifier, use the
backticks (`).
+
+### Literal
+
+Types of literals include:
+
+- string: enclosed in single quotes (') or double quotes (")
+- int: it is generally a positive integer, such as 0-9;
+Note: some DistSQL syntax allows negative values. In this case, a negative
sign (-) can be added before the number, such as - 1.
Review Comment:
No space required between minus and number.
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