ALTER TABLE 语句也可用于重命名或删除现有表中的列 使用ALTER TABLE ADD语句向现有表中添加一列或多列。 Syntax: ALTER TABLE [schema_name.]table_name ADD column_name1 data_type constraint, column_name2 data_type constraint... column_nameN ...

Extracts column names and tables used by the query. Automatically conduct column alias resolution, sub queries aliases resolution as well as tables aliases resolving. Provides also a helper for ...

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President Trump announced his first deal on Thursday since launching a global trade war. He unveiled a limited pact with the United Kingdom that would lower barriers on some goods, such as ...

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