Su, Xiaomeng 76a5b1ee83 dli_sqlreference_20240227

Reviewed-by: Pruthi, Vineet <vineet.pruthi@t-systems.com>
Co-authored-by: Su, Xiaomeng <suxiaomeng1@huawei.com>
Co-committed-by: Su, Xiaomeng <suxiaomeng1@huawei.com>

2024-03-27 22:02:33 +00:00

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Adding a Column

Function

This statement is used to add one or more new columns to a table.

Syntax

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ALTER TABLE [db_name.]table_name ADD COLUMNS (col_name1 col_type1 [COMMENT col_comment1], ...);

Keywords

ADD COLUMNS: columns to add
COMMENT: column description

Parameters

**Table 1** Parameters
Parameter	Description
db_name	Database name that contains letters, digits, and underscores (_). It cannot contain only digits or start with an underscore (_).
table_name	Table name
col_name	Column name
col_type	Field type
col_comment	Column description

Precautions

Do not run this SQL statement concurrently. Otherwise, columns may be overwritten.

Example

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ALTER TABLE t1 ADD COLUMNS (column2 int, column3 string);

Parent topic: Modifying a Table

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