This statement is used to add one or more new columns to a table.
1 | ALTER TABLE [db_name.]table_name ADD COLUMNS (col_name1 col_type1 [COMMENT col_comment1], ...); |
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 |
Do not run this SQL statement concurrently. Otherwise, columns may be overwritten.
1 | ALTER TABLE t1 ADD COLUMNS (column2 int, column3 string); |