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       - [`SELECT`](/sql-statements/sql-statement-select.md)
       - [`SET [NAMES|CHARACTER SET]`](/sql-statements/sql-statement-set-names.md)
       - [`SET PASSWORD`](/sql-statements/sql-statement-set-password.md)
+      - [`SET ROLE`](/sql-statements/sql-statement-set-role.md)
       - [`SET TRANSACTION`](/sql-statements/sql-statement-set-transaction.md)
       - [`SET [GLOBAL|SESSION] <variable>`](/sql-statements/sql-statement-set-variable.md)
       - [`SHOW CHARACTER SET`](/sql-statements/sql-statement-show-character-set.md)
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+---
+title: SET ROLE
+summary: TiDB 数据库中 SET ROLE 的使用概况。
+category: reference
+---
+
+# SET ROLE
+
+`SET ROLE` 用于在当前用户会话中启用角色。使用 `SET ROLE` 启用角色后，用户可以使用这些角色的权限。
+
+## 语法图
+
+**SetRoleStmt:**
+
+![SetRoleStmt](/media/sqlgram/SetRoleStmt.png)
+
+**SetRoleOpt:**
+
+![SetRoleOpt](/media/sqlgram/SetRoleOpt.png)
+
+**SetDefaultRoleOpt:**
+
+![SetDefaultRoleOpt](/media/sqlgram/SetDefaultRoleOpt.png)
+
+## 示例
+
+创建一个用户 `'u1'@'%'`, 创建三个角色 `'r1'@'%'`, `'r2'@'%'`, `'r3'@'%'` 并将这些角色授予给 `'u1'@'%'`。
+将 `'u1'@'%'` 的默认启用角色设置为 `'r1'@'%'`。
+
+{{< copyable "sql" >}}
+
+```sql
+CREATE USER 'u1'@'%';
+CREATE ROLE 'r1', 'r2', 'r3';
+GRANT 'r1', 'r2', 'r3' TO 'u1'@'%'; 
+SET DEFAULT ROLE 'r1' TO 'u1'@'%'; 
+```
+
+使用 `'u1'@'%'` 登录，执行 `SET ROLE` 将启用角色设置为 `ALL`。
+
+{{< copyable "sql" >}}
+
+```sql
+SET ROLE ALL;
+SELECT CURRENT_ROLE();
+```
+
+```
++----------------------------+
+| CURRENT_ROLE()             |
++----------------------------+
+| `r1`@`%`,`r2`@`%`,`r3`@`%` |
++----------------------------+
+1 row in set (0.000 sec)
+```
+
+执行 `SET ROLE` 将启用角色设置为 `'r2'` 和 `'r3'`。
+
+{{< copyable "sql" >}}
+
+```sql
+SET ROLE 'r2', 'r3';
+SELECT CURRENT_ROLE();
+```
+
+```
++-------------------+
+| CURRENT_ROLE()    |
++-------------------+
+| `r2`@`%`,`r3`@`%` |
++-------------------+
+1 row in set (0.000 sec)
+```
+
+执行 `SET ROLE` 将启用角色设置为 `DEFALUT`。
+
+{{< copyable "sql" >}}
+
+```sql
+SET ROLE DEFAULT;
+SELECT CURRENT_ROLE();
+```
+
+```
++----------------+
+| CURRENT_ROLE() |
++----------------+
+| `r1`@`%`       |
++----------------+
+1 row in set (0.000 sec)
+```
+
+执行 `SET ROLE` 将启用角色设置为 `NONE`。
+
+{{< copyable "sql" >}}
+
+```sql
+SET ROLE NONE;
+SELECT CURRENT_ROLE();
+```
+
+```
++----------------+
+| CURRENT_ROLE() |
++----------------+
+|                |
++----------------+
+1 row in set (0.000 sec)
+```
+
+## 另请参阅
+
+* [基于角色的访问控制](/role-based-access-control.md)