diff --git a/README.md b/README.md
index 3a38902..000c6ac 100644
--- a/README.md
+++ b/README.md
@@ -44,6 +44,7 @@ const editor = new EditorView({
       autocomplete: cteCompletionSource,
     }),
     sqlExtension({
+      sqlParser: new SqlParser({ dialect: "MySQL" }),
       linterConfig: {
         delay: 250 // Validation delay in ms
       },
diff --git a/demo/index.ts b/demo/index.ts
index 3147b7d..f21b2ab 100644
--- a/demo/index.ts
+++ b/demo/index.ts
@@ -2,6 +2,7 @@ import { StandardSQL, sql } from "@codemirror/lang-sql";
 import { basicSetup, EditorView } from "codemirror";
 import { cteCompletionSource } from "../src/sql/cte-completion-source.js";
 import { sqlExtension } from "../src/sql/extension.js";
+import { SqlParser } from "../src/sql/parser.js";
 
 // Default SQL content for the demo
 const defaultSqlDoc = `-- Welcome to the SQL Editor Demo!
@@ -109,6 +110,9 @@ function initializeEditor() {
       upperCaseKeywords: true,
     }),
     sqlExtension({
+      // Parser definition
+      sqlParser: new SqlParser({ dialect: "PostgresQL" }),
+
       // Linter extension configuration
       linterConfig: {
         delay: 250, // Delay before running validation
diff --git a/src/sql/__tests__/diagnostics.test.ts b/src/sql/__tests__/diagnostics.test.ts
index 6394edd..ac2e6e5 100644
--- a/src/sql/__tests__/diagnostics.test.ts
+++ b/src/sql/__tests__/diagnostics.test.ts
@@ -2,7 +2,9 @@ import { Text } from "@codemirror/state";
 import type { EditorView } from "@codemirror/view";
 import { describe, expect, it, vi } from "vitest";
 import { sqlLinter } from "../diagnostics.js";
-import type { SqlParser } from "../parser.js";
+import { SqlParser } from "../parser.js";
+
+const defaultParser = new SqlParser({ dialect: "PostgresQL" });
 
 // Mock EditorView
 const _createMockView = (content: string) => {
@@ -14,12 +16,12 @@ const _createMockView = (content: string) => {
 
 describe("sqlLinter", () => {
   it("should create a linter extension", () => {
-    const linter = sqlLinter();
+    const linter = sqlLinter(defaultParser);
     expect(linter).toBeDefined();
   });
 
   it("should accept configuration with custom delay", () => {
-    const linter = sqlLinter({ delay: 1000 });
+    const linter = sqlLinter(defaultParser, { delay: 1000 });
     expect(linter).toBeDefined();
   });
 
@@ -29,22 +31,17 @@ describe("sqlLinter", () => {
       parseSql: vi.fn(() => ({ statements: [] })),
     } as unknown as SqlParser;
 
-    const linter = sqlLinter({ parser: mockParser });
+    const linter = sqlLinter(mockParser);
     expect(linter).toBeDefined();
   });
 
   it("should use default delay when no delay provided", () => {
-    const linter = sqlLinter();
+    const linter = sqlLinter(defaultParser);
     expect(linter).toBeDefined();
   });
 
   it("should use custom delay when provided", () => {
-    const linter = sqlLinter({ delay: 500 });
-    expect(linter).toBeDefined();
-  });
-
-  it("should use default parser when no parser provided", () => {
-    const linter = sqlLinter();
+    const linter = sqlLinter(defaultParser, { delay: 500 });
     expect(linter).toBeDefined();
   });
 });
diff --git a/src/sql/__tests__/parser.test.ts b/src/sql/__tests__/parser.test.ts
index 7afcd49..7820ed2 100644
--- a/src/sql/__tests__/parser.test.ts
+++ b/src/sql/__tests__/parser.test.ts
@@ -2,7 +2,7 @@ import { describe, expect, it } from "vitest";
 import { SqlParser } from "../parser.js";
 
 describe("SqlParser", () => {
-  const parser = new SqlParser();
+  const parser = new SqlParser({ dialect: "PostgresQL" });
 
   describe("parse", () => {
     it("should parse valid SQL successfully", () => {
@@ -67,3 +67,21 @@ describe("SqlParser", () => {
     });
   });
 });
+
+describe("Dialects", () => {
+  it("should parse valid SQL based on dialect", () => {
+    const sql = "SELECT * FROM table_function();";
+
+    const parser = new SqlParser({ dialect: "PostgresQL" });
+    const result = parser.parse(sql);
+    expect(result.success).toBe(true);
+    expect(result.errors).toHaveLength(0);
+    expect(result.ast).toBeDefined();
+
+    // MySQL does not support calling functions as tables
+    const mysqlParser = new SqlParser({ dialect: "MySQL" });
+    const mysqlResult = mysqlParser.parse(sql);
+    expect(mysqlResult.success).toBe(false);
+    expect(mysqlResult.errors).toHaveLength(1);
+  });
+});
diff --git a/src/sql/__tests__/structure-analyzer.test.ts b/src/sql/__tests__/structure-analyzer.test.ts
index 9337bc5..1a77f47 100644
--- a/src/sql/__tests__/structure-analyzer.test.ts
+++ b/src/sql/__tests__/structure-analyzer.test.ts
@@ -1,5 +1,6 @@
 import { EditorState } from "@codemirror/state";
 import { beforeEach, describe, expect, it } from "vitest";
+import { SqlParser } from "../parser.js";
 import { SqlStructureAnalyzer } from "../structure-analyzer.js";
 
 describe("SqlStructureAnalyzer", () => {
@@ -7,7 +8,8 @@ describe("SqlStructureAnalyzer", () => {
   let state: EditorState;
 
   beforeEach(() => {
-    analyzer = new SqlStructureAnalyzer();
+    const parser = new SqlParser({ dialect: "PostgresQL" });
+    analyzer = new SqlStructureAnalyzer(parser);
   });
 
   const createState = (content: string) => {
diff --git a/src/sql/__tests__/structure-extension.test.ts b/src/sql/__tests__/structure-extension.test.ts
index 2249d84..57f0fef 100644
--- a/src/sql/__tests__/structure-extension.test.ts
+++ b/src/sql/__tests__/structure-extension.test.ts
@@ -1,14 +1,17 @@
 import { EditorState, Text } from "@codemirror/state";
 import type { EditorView } from "@codemirror/view";
 import { describe, expect, it } from "vitest";
+import { SqlParser } from "../parser.js";
 import { sqlStructureGutter } from "../structure-extension.js";
 
+const defaultParser = new SqlParser({ dialect: "PostgresQL" });
+
 // Mock EditorView
 const _createMockView = (content: string, hasFocus = true) => {
   const doc = Text.of(content.split("\n"));
   const state = EditorState.create({
     doc,
-    extensions: [sqlStructureGutter()],
+    extensions: [sqlStructureGutter(defaultParser)],
   });
 
   return {
@@ -20,7 +23,7 @@ const _createMockView = (content: string, hasFocus = true) => {
 
 describe("sqlStructureGutter", () => {
   it("should create a gutter extension with default config", () => {
-    const extensions = sqlStructureGutter();
+    const extensions = sqlStructureGutter(defaultParser);
     expect(Array.isArray(extensions)).toBe(true);
     expect(extensions.length).toBeGreaterThan(0);
   });
@@ -36,25 +39,25 @@ describe("sqlStructureGutter", () => {
       hideWhenNotFocused: true,
     };
 
-    const extensions = sqlStructureGutter(config);
+    const extensions = sqlStructureGutter(defaultParser, config);
     expect(Array.isArray(extensions)).toBe(true);
     expect(extensions.length).toBeGreaterThan(0);
   });
 
   it("should handle empty configuration", () => {
-    const extensions = sqlStructureGutter({});
+    const extensions = sqlStructureGutter(defaultParser);
     expect(Array.isArray(extensions)).toBe(true);
   });
 
   it("should create extensions for all required parts", () => {
-    const extensions = sqlStructureGutter();
+    const extensions = sqlStructureGutter(defaultParser);
     // Should include state field, update listener, theme, and gutter
     expect(extensions.length).toBe(4);
   });
 
   it("should handle unfocusedOpacity configuration", () => {
     const config = { unfocusedOpacity: 0.2 };
-    const extensions = sqlStructureGutter(config);
+    const extensions = sqlStructureGutter(defaultParser, config);
     expect(extensions.length).toBe(4);
   });
 
@@ -62,13 +65,13 @@ describe("sqlStructureGutter", () => {
     const config = {
       whenHide: (view: EditorView) => view.state.doc.length === 0,
     };
-    const extensions = sqlStructureGutter(config);
+    const extensions = sqlStructureGutter(defaultParser, config);
     expect(extensions.length).toBe(4);
   });
 
   it("should work with minimal configuration", () => {
     const config = { width: 2 };
-    const extensions = sqlStructureGutter(config);
+    const extensions = sqlStructureGutter(defaultParser, config);
     expect(extensions.length).toBe(4);
   });
 });
diff --git a/src/sql/diagnostics.ts b/src/sql/diagnostics.ts
index 93c2465..5c7c361 100644
--- a/src/sql/diagnostics.ts
+++ b/src/sql/diagnostics.ts
@@ -1,7 +1,7 @@
 import { type Diagnostic, linter } from "@codemirror/lint";
 import type { Text } from "@codemirror/state";
 import type { EditorView } from "@codemirror/view";
-import { type SqlParseError, SqlParser } from "./parser.js";
+import type { SqlParseError, SqlParser } from "./parser.js";
 
 const DEFAULT_DELAY = 750;
 
@@ -11,8 +11,6 @@ const DEFAULT_DELAY = 750;
 export interface SqlLinterConfig {
   /** Delay in milliseconds before running validation (default: 750) */
   delay?: number;
-  /** Custom SQL parser instance to use for validation */
-  parser?: SqlParser;
 }
 
 /**
@@ -48,9 +46,7 @@ function convertToCodeMirrorDiagnostic(error: SqlParseError, doc: Text): Diagnos
  * });
  * ```
  */
-export function sqlLinter(config: SqlLinterConfig = {}) {
-  const parser = config.parser || new SqlParser();
-
+export function sqlLinter(parser: SqlParser, config: SqlLinterConfig = {}) {
   return linter(
     (view: EditorView): Diagnostic[] => {
       const doc = view.state.doc;
@@ -65,7 +61,7 @@ export function sqlLinter(config: SqlLinterConfig = {}) {
       return errors.map((error) => convertToCodeMirrorDiagnostic(error, doc));
     },
     {
-      delay: config.delay || DEFAULT_DELAY,
+      delay: config.delay ?? DEFAULT_DELAY,
     },
   );
 }
diff --git a/src/sql/extension.ts b/src/sql/extension.ts
index e04d9b6..e21793f 100644
--- a/src/sql/extension.ts
+++ b/src/sql/extension.ts
@@ -1,12 +1,20 @@
 import type { Extension } from "@codemirror/state";
 import { type SqlLinterConfig, sqlLinter } from "./diagnostics.js";
 import { type SqlHoverConfig, sqlHover, sqlHoverTheme } from "./hover.js";
+import { SqlParser } from "./parser.js";
 import { type SqlGutterConfig, sqlStructureGutter } from "./structure-extension.js";
 
 /**
  * Configuration options for the SQL extension
  */
 export interface SqlExtensionConfig {
+  /**
+   * The SQL parser used for linting and gutter markers.
+   * If not provided, a default PostgreSQL parser is created.
+   * The parser instance is shared across the extension.
+   */
+  sqlParser?: SqlParser;
+
   /** Whether to enable SQL linting (default: true) */
   enableLinting?: boolean;
   /** Configuration for the SQL linter */
@@ -53,17 +61,22 @@ export function sqlExtension(config: SqlExtensionConfig = {}): Extension[] {
     enableLinting = true,
     enableGutterMarkers = true,
     enableHover = true,
+    sqlParser,
     linterConfig,
     gutterConfig,
     hoverConfig,
   } = config;
 
-  if (enableLinting) {
-    extensions.push(sqlLinter(linterConfig));
-  }
+  if (enableLinting || enableGutterMarkers) {
+    const parser = sqlParser ?? new SqlParser({ dialect: "PostgresQL" });
+
+    if (enableLinting) {
+      extensions.push(sqlLinter(parser, linterConfig));
+    }
 
-  if (enableGutterMarkers) {
-    extensions.push(sqlStructureGutter(gutterConfig));
+    if (enableGutterMarkers) {
+      extensions.push(sqlStructureGutter(parser, gutterConfig));
+    }
   }
 
   if (enableHover) {
diff --git a/src/sql/parser.ts b/src/sql/parser.ts
index d2f51d6..4acca60 100644
--- a/src/sql/parser.ts
+++ b/src/sql/parser.ts
@@ -26,20 +26,44 @@ export interface SqlParseResult {
   ast?: unknown;
 }
 
+// https://github.com/taozhi8833998/node-sql-parser?tab=readme-ov-file#supported-database-sql-syntax
+export type SupportedDialects =
+  | "Athena"
+  | "BigQuery"
+  | "DB2"
+  | "Hive"
+  | "MariaDB"
+  | "MySQL"
+  | "PostgresQL"
+  | "Redshift"
+  | "Sqlite"
+  | "TransactSQL"
+  | "FlinkSQL"
+  | "Snowflake"
+  | "Noql";
+
+export interface SqlParserConfig {
+  /** The database dialect to use for parsing */
+  dialect: SupportedDialects;
+}
+
 /**
  * A SQL parser wrapper around node-sql-parser with enhanced error handling
  * and validation capabilities for CodeMirror integration.
  */
 export class SqlParser {
   private parser: Parser;
+  private dialect: SupportedDialects;
 
-  constructor() {
+  constructor(config: SqlParserConfig) {
     this.parser = new Parser();
+    this.dialect = config.dialect;
   }
 
   parse(sql: string): SqlParseResult {
     try {
-      const ast = this.parser.astify(sql);
+      const dialect = this.dialect;
+      const ast = this.parser.astify(sql, { database: dialect });
 
       return {
         success: true,
diff --git a/src/sql/structure-analyzer.ts b/src/sql/structure-analyzer.ts
index f99afba..2acae8d 100644
--- a/src/sql/structure-analyzer.ts
+++ b/src/sql/structure-analyzer.ts
@@ -1,5 +1,5 @@
 import type { EditorState } from "@codemirror/state";
-import { SqlParser } from "./parser.js";
+import type { SqlParser } from "./parser.js";
 
 /**
  * Represents a SQL statement with position information
@@ -29,8 +29,8 @@ export class SqlStructureAnalyzer {
   private parser: SqlParser;
   private cache = new Map<string, SqlStatement[]>();
 
-  constructor() {
-    this.parser = new SqlParser();
+  constructor(parser: SqlParser) {
+    this.parser = parser;
   }
 
   /**
diff --git a/src/sql/structure-extension.ts b/src/sql/structure-extension.ts
index 1ab1458..0c5f8e4 100644
--- a/src/sql/structure-extension.ts
+++ b/src/sql/structure-extension.ts
@@ -1,5 +1,6 @@
 import { type Extension, RangeSet, StateEffect, StateField } from "@codemirror/state";
 import { EditorView, GutterMarker, gutter, type ViewUpdate } from "@codemirror/view";
+import type { SqlParser } from "./parser.js";
 import { type SqlStatement, SqlStructureAnalyzer } from "./structure-analyzer.js";
 
 export interface SqlGutterConfig {
@@ -229,8 +230,8 @@ function createSqlGutter(config: SqlGutterConfig): Extension {
  * based on cursor position. Highlights the current statement and shows dimmed
  * indicators for other statements.
  */
-export function sqlStructureGutter(config: SqlGutterConfig = {}): Extension[] {
-  const analyzer = new SqlStructureAnalyzer();
+export function sqlStructureGutter(parser: SqlParser, config: SqlGutterConfig = {}): Extension[] {
+  const analyzer = new SqlStructureAnalyzer(parser);
 
   return [
     sqlGutterStateField,