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44 lines
1.9 KiB
Markdown
44 lines
1.9 KiB
Markdown
---
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toc_priority: 41
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toc_title: ROW POLICY
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---
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# CREATE ROW POLICY {#create-row-policy-statement}
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Creates [filters for rows](../../../operations/access-rights.md#row-policy-management), which a user can read from a table.
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Syntax:
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``` sql
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CREATE [ROW] POLICY [IF NOT EXISTS | OR REPLACE] policy_name1 [ON CLUSTER cluster_name1] ON [db1.]table1
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[, policy_name2 [ON CLUSTER cluster_name2] ON [db2.]table2 ...]
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[AS {PERMISSIVE | RESTRICTIVE}]
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[FOR SELECT]
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[USING condition]
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[TO {role1 [, role2 ...] | ALL | ALL EXCEPT role1 [, role2 ...]}]
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```
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`ON CLUSTER` clause allows creating row policies on a cluster, see [Distributed DDL](../../../sql-reference/distributed-ddl.md).
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## AS Clause {#create-row-policy-as}
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Using this section you can create permissive or restrictive policies.
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Permissive policy grants access to rows. Permissive policies which apply to the same table are combined together using the boolean `OR` operator. Policies are permissive by default.
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Restrictive policy restricts access to rows. Restrictive policies which apply to the same table are combined together using the boolean `AND` operator.
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Restrictive policies apply to rows that passed the permissive filters. If you set restrictive policies but no permissive policies, the user can’t get any row from the table.
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## TO Clause {#create-row-policy-to}
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In the section `TO` you can provide a mixed list of roles and users, for example, `CREATE ROW POLICY ... TO accountant, john@localhost`.
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Keyword `ALL` means all the ClickHouse users including current user. Keywords `ALL EXCEPT` allow to exclude some users from the all users list, for example, `CREATE ROW POLICY ... TO ALL EXCEPT accountant, john@localhost`
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## Examples {#examples}
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`CREATE ROW POLICY filter ON mydb.mytable FOR SELECT USING a<1000 TO accountant, john@localhost`
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`CREATE ROW POLICY filter ON mydb.mytable FOR SELECT USING a<1000 TO ALL EXCEPT mira`
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