使用新的DROPcolumn子句删除列。

Dropping a column, using the new DROP column clause.

youdao

在重要的、与我们相关的列中包含where子句谓词。

Include WHERE clause predicates for only the columns that are important and relevant to us.

youdao

在重要的、与我们相关的列中包含where子句谓词。

Include WHERE clause predicates for only the columns that are important and relevant to us.

youdao