---
{
    "title": "CREATE-POLICY",
    "language": "en"
}
---

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## CREATE-POLICY

### Name

CREATE POLICY

### Description

Create security policies and explain to view the rewritten SQL.

#### 行安全策略
grammar：

```sql
CREATE ROW POLICY test_row_policy_1 ON test.table1 
AS {RESTRICTIVE|PERMISSIVE} TO test USING (id in (1, 2));
```

illustrate：

- filterType：It is usual to constrict a set of policies through AND. PERMISSIVE to constrict a set of policies through OR
- Configure multiple policies. First, merge the RESTRICTIVE policy with the PERMISSIVE policy
- It is connected with AND between RESTRICTIVE AND PERMISSIVE
- It cannot be created for users root and admin

### Example

1. Create a set of row security policies

   ```sql
   CREATE ROW POLICY test_row_policy_1 ON test.table1 
   AS RESTRICTIVE TO test USING (c1 = 'a');
   ```
   ```sql
   CREATE ROW POLICY test_row_policy_2 ON test.table1 
   AS RESTRICTIVE TO test USING (c2 = 'b');
   ```
   ```sql
   CREATE ROW POLICY test_row_policy_3 ON test.table1 
   AS PERMISSIVE TO test USING (c3 = 'c');
   ```
   ```sql
   CREATE ROW POLICY test_row_policy_3 ON test.table1 
   AS PERMISSIVE TO test USING (c4 = 'd');
   ```

   When we execute the query on Table1, the rewritten SQL is

   ```sql
   select * from (select * from table1 where c1 = 'a' and c2 = 'b' or c3 = 'c' or c4 = 'd')
   ```

### Keywords

    CREATE, POLICY

### Best Practice