alter-merge table column-docstringsalter-merge table column-docstrings

• 07/01/2020
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设置指定表的一个或多个列的 docstring 属性。Sets the docstring property of one or more columns of the specified table. 未显式设置的列保留此属性的现有值（如果有）。Columns not explicitly set retain their existing value for this property, if they have one.

有关 alter table column-docstring 的信息，请参阅 下方内容。For alter table column-docstring, see below.

语法Syntax

.alter-merge table TableName column-docstring ( Col1 : Docstring1 [, Col2 : Docstring2]... ).alter-merge table TableName column-docstring ( Col1 : Docstring1 [, Col2 : Docstring2]... )

示例Example

.alter-merge table Table1 column-docstrings (Column1:"DocString1", Column2:"DocString2")

alter table column-docstringsalter table column-docstrings

设置指定表的一个或多个列的 docstring 属性。Sets the docstring property of one or more columns of the specified table. 未显式设置的列将删除此属性。Columns not explicitly set will have this property removed.

语法Syntax

.alter table TableName column-docstring ( Col1 : Docstring1 [, Col2 : Docstring2]... ).alter table TableName column-docstring ( Col1 : Docstring1 [, Col2 : Docstring2]... )

示例Example

.alter table Table1 column-docstrings (Column1:"DocString1", Column2:"DocString2")