diff --git a/docs/en/sql-reference/statements/alter/column.md b/docs/en/sql-reference/statements/alter/column.md index 0fa2c492bee7ea4b4e939eb0d54a80adcb3c77a8..16aa266ebf9189796d4d3b454d78593fde3d0f22 100644 --- a/docs/en/sql-reference/statements/alter/column.md +++ b/docs/en/sql-reference/statements/alter/column.md @@ -25,6 +25,7 @@ The following actions are supported: - [COMMENT COLUMN](#alter_comment-column) — Adds a text comment to the column. - [MODIFY COLUMN](#alter_modify-column) — Changes column’s type, default expression and TTL. - [MODIFY COLUMN REMOVE](#modify-remove) — Removes one of the column properties. +- [RENAME COLUMN](#alter_rename-column) — Renames an existing column. These actions are described in detail below. @@ -183,6 +184,22 @@ ALTER TABLE table_with_ttl MODIFY COLUMN column_ttl REMOVE TTL; - [REMOVE TTL](ttl.md). +## RENAME COLUMN {#alter_rename-column} + +Renames an existing column. + +Syntax: + +```sql +ALTER TABLE table_name RENAME COLUMN column_name TO new_column_name; +``` + +**Example** + +```sql +ALTER TABLE table_with_ttl RENAME COLUMN column_ttl TO column_ttl_new; +``` + ## Limitations {#alter-query-limitations} The `ALTER` query lets you create and delete separate elements (columns) in nested data structures, but not whole nested data structures. To add a nested data structure, you can add columns with a name like `name.nested_name` and the type `Array(T)`. A nested data structure is equivalent to multiple array columns with a name that has the same prefix before the dot.