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@ -122,9 +122,9 @@ Example:
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ALTER TABLE visits MODIFY COLUMN browser Array(String)
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ALTER TABLE visits MODIFY COLUMN browser Array(String)
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```
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```
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## ALTER TABLE MODIFY col_name REMOVE what_to_remove
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## MODIFY REMOVE
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Removes something from the specific column.
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Removes something from a column. For example, ______
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Syntax:
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Syntax:
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@ -146,8 +146,8 @@ Result
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## See Also
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## See Also
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- More about [ALTER](../../sql-reference/statements/alter/#query_language_queries_alter).
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- [ALTER](../../sql-reference/statements/alter/#query_language_queries_alter).
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- More about [MODIFY column](../../sql-reference/statements/alter/column/#alter_modify-column).
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- [MODIFY column](../../sql-reference/statements/alter/column/#alter_modify-column).
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Changing the column type is the only complex action – it changes the contents of files with data. For large tables, this may take a long time.
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Changing the column type is the only complex action – it changes the contents of files with data. For large tables, this may take a long time.
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@ -5,15 +5,17 @@ toc_title: TTL
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# Manipulations with Table TTL {#manipulations-with-table-ttl}
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# Manipulations with Table TTL {#manipulations-with-table-ttl}
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## MODIFY TTL {#modify-ttl}
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You can change [table TTL](../../../engines/table-engines/mergetree-family/mergetree.md#mergetree-table-ttl) with a request of the following form:
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You can change [table TTL](../../../engines/table-engines/mergetree-family/mergetree.md#mergetree-table-ttl) with a request of the following form:
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``` sql
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``` sql
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ALTER TABLE table_name MODIFY TTL ttl_expression;
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ALTER TABLE table_name MODIFY TTL ttl_expression;
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```
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```
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## ALTER TABLE REMOVE TTL
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## REMOVE TTL {remove-ttl}
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Removes ttl-property from the specified column.
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Removes TTL-property from the specified column.
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Syntax:
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Syntax:
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@ -23,6 +25,12 @@ ALTER TABLE table_name MODIFY column_name REMOVE TTL
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**Example**
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**Example**
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<!--Попробовать:
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посмотреть установленные TTL,
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показать состояние таблицы до,
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удалить TTL
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и показать состояние после.-->
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Request
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Request
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```sql
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```sql
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