ddl 语句
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ddl 语句

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ddl 新增列

ALTER TABLE table_name ADD COLUMNS (col_name STRING)

ddl 修改列

ALTER TABLE table_name CHANGE col_name_0 col_name_1 string COMMENT '商品向量'

col_name_0 可以 与 col_name_1 是同一个名称,这样的作用就是直接修改列的类型了

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