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体验新版 GitCode,发现更多精彩内容 >>
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ac4e9952
编写于
12月 07, 2020
作者:
A
ana-uvarova
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docs/en/sql-reference/statements/alter/column.md
docs/en/sql-reference/statements/alter/column.md
+5
-6
docs/en/sql-reference/statements/alter/ttl.md
docs/en/sql-reference/statements/alter/ttl.md
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docs/en/sql-reference/statements/alter/column.md
浏览文件 @
ac4e9952
...
...
@@ -122,14 +122,14 @@ Example:
ALTER
TABLE
visits
MODIFY
COLUMN
browser
Array
(
String
)
```
## ALTER TABLE MODIFY
COLUMN
col_name REMOVE what_to_remove
## ALTER TABLE MODIFY col_name REMOVE what_to_remove
Removes something from the specific column.
Syntax:
```
sql
ALTER
TABLE
table_name
MO
FIY
COLUMN
column_name
REMOVE
removing_part
ALTER
TABLE
table_name
MO
DIFY
column_name
REMOVE
removing_part
```
**Example**
...
...
@@ -144,11 +144,10 @@ Result
```
## See Also (Optional)
Links to related topics as a list.
## See Also
-
[
link
](
#
)
-
More about
[
ALTER
](
../../sql-reference/statements/alter/#query_language_queries_alter
)
.
-
More about
[
MODIFY column
](
../../sql-reference/statements/alter/column/#alter_modify-column
)
.
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.
...
...
docs/en/sql-reference/statements/alter/ttl.md
浏览文件 @
ac4e9952
...
...
@@ -3,33 +3,30 @@ toc_priority: 44
toc_title
:
TTL
---
#
##
Manipulations with Table TTL {#manipulations-with-table-ttl}
# Manipulations with Table TTL {#manipulations-with-table-ttl}
You can change
[
table TTL
](
../../../engines/table-engines/mergetree-family/mergetree.md#mergetree-table-ttl
)
with a request of the following form:
```
sql
ALTER
TABLE
table
-
name
MODIFY
TTL
ttl
-
expression
ALTER
TABLE
table
_name
MODIFY
TTL
ttl_expression
;
```
# ALTER TABLE REMOVE TTL
#
#
ALTER TABLE REMOVE TTL
Removes ttl-property from the column.
Removes ttl-property from the
specified
column.
Syntax:
```
sql
ALTER
TABLE
table_name
REMOVE
TTL
Syntax
of
the
statement
.
ALTER
TABLE
table_name
MODIFY
column_name
REMOVE
TTL
```
ALTER TABLE r_no_prop_table MODIFY COLUMN some_column REMOVE TTL;
**Example**
Request
```
sql
ALTER
TABLE
r_no_prop_table
MODIFY
COLUMN
some_column
REMOVE
TTL
;
```
Result
...
...
@@ -38,8 +35,7 @@ Result
```
## See Also (Optional)
Links to related topics as a list.
### See Also
-
[
link
](
#
)
-
More about the
[
TTL-expression
](
../../sql-reference/statements/create/table/#ttl-expression
)
.
-
Modify column
[
with TTL
](
../../sql-reference/statements/alter/column/#alter_modify-column
)
.
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