ClickHouse/docs/en/operations/system-tables/detached_parts.md

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slug: /en/operations/system-tables/detached_parts
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# detached_parts

Contains information about detached parts of [MergeTree](../../engines/table-engines/mergetree-family/mergetree.md) tables. The `reason` column specifies why the part was detached.

For user-detached parts, the reason is empty. Such parts can be attached with [ALTER TABLE ATTACH PARTITION\|PART](../../sql-reference/statements/alter/partition.md#alter_attach-partition) command.

For the description of other columns, see [system.parts](../../operations/system-tables/parts.md#system_tables-parts).

If part name is invalid, values of some columns may be `NULL`. Such parts can be deleted with [ALTER TABLE DROP DETACHED PART](../../sql-reference/statements/alter/partition.md#alter_drop-detached).
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[docs] split aggregate function and system table references (#11742) * prefer relative links from root * wip * split aggregate function reference * split system tables 2020-06-18 08:24:31 +00:00
			Contains information about detached parts of [MergeTree](../../engines/table-engines/mergetree-family/mergetree.md) tables. The `reason` column specifies why the part was detached.

[docs] split the ALTER article (#12502) * initial split * initial adjust links * make en buildable * re-normalize 2020-07-14 21:02:41 +00:00			`For user-detached parts, the reason is empty. Such parts can be attached with [ALTER TABLE ATTACH PARTITION\\|PART](../../sql-reference/statements/alter/partition.md#alter_attach-partition) command.`
[docs] split aggregate function and system table references (#11742) * prefer relative links from root * wip * split aggregate function reference * split system tables 2020-06-18 08:24:31 +00:00
[docs] split various kinds of CREATE queries into separate articles (#12328) * normalize * split & adjust links * re-normalize * adjust ru links * adjust ja/tr links * partially apply e0d19d2aeaeafa3620305bce3a991fefc0e28695 * reset contribs 2020-07-09 15:10:35 +00:00			`For the description of other columns, see [system.parts](../../operations/system-tables/parts.md#system_tables-parts).`
[docs] split aggregate function and system table references (#11742) * prefer relative links from root * wip * split aggregate function reference * split system tables 2020-06-18 08:24:31 +00:00
[docs] split the ALTER article (#12502) * initial split * initial adjust links * make en buildable * re-normalize 2020-07-14 21:02:41 +00:00			If part name is invalid, values of some columns may be `NULL`. Such parts can be deleted with [ALTER TABLE DROP DETACHED PART](../../sql-reference/statements/alter/partition.md#alter_drop-detached).