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在创建模型时,一般会在向导中勾选一些数据表,而进入设计器后也经常需要增加或删除数据表。
在添加新表时,可以直接绑定已有的数据表也可以通过SQL查询的方式创建新表。
1. 单击设计画布上方的添加表。
2. 输入新表的名称。
3. 绑定表。我们有两种方法可以绑定表,一是通过直接选择数据库中的表;二是通过 SQL 表达式。
如果选择表,则选择数据库中所需的数据表,并验证。
如果选择SQL查询,则根据当前所连数据库的语法输入表达式语句,并验证。
type=info
提示
如果使用的是 DB2 数据库,那么在使用聚合列时需要为列添加别名,否则将会预览失败。
例如:
4. 无论使用表还是 SQL 的方式,只有通过验证后,才可以单击添加按钮。
type=info
提示
可设置该表是否隐藏。
5. 可见新增加的表已经出现在数据表列表中了。
type=info
提示
通过SQL查询语句添加的新表,支持再次编辑修改。所以表右侧多一个铅笔按钮,单击之后可进入编辑界面。修改后需要再次验证,然后保存修改。
单击预览按钮,可预览表。
方法一:
在表上单击更多按钮,然后选择删除表。
在弹出的对话框点击是。
方法二:
在画布当中单击表,然后单击弹出的删除按钮。
然后在弹出的对话框点击是。