To better illustrate the improvement in cardinality estimation, drop all the existing indexes on the EMPLOYEE table except the primary key index.

为了更好地解释说明基数估计值的提高，撤销除主键索引外的所有employee表上的现有索引。

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Find the constraint name for the unique/primary key, disable the constraint and drop the tablespace again.

找到那些惟一/主键约束名，禁用这些约束然后再次删除表空间。

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You can drag and drop fields to make new tables, and to move fields between tables. You can also rename the tables, and set primary key fields.

既可以拖放字段形成新表，也可以在两表之间移动字段，还可以重命名表和设置主键字段。

youdao

You can drag and drop fields to make new tables, and to move fields between tables. You can also rename the tables, and set primary key fields.

既可以拖放字段形成新表，也可以在两表之间移动字段，还可以重命名表和设置主键字段。

youdao