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Which of the following can be used to ensure that once a row has been inserted in table TABLEX, the column MAINID in that row cannot be updated?（）
- A、Define the column MAINID as NOT UPDATABLE
- B、Define the column MAINID as a PRIMARY KEY
- C、Define the column MAINID as a FOREIGN KEY
- D、Define an UPDATE trigger on table TABLEX
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更多 “Which of the following can be used to ensure that once a row has been inserted in table TABLEX, the column MAINID in that row cannot be updated?（）A、Define the column MAINID as NOT UPDATABLEB、Define the column MAINID as a PRIMARY KEYC、Define the column MAINID as a FOREIGN KEYD、Define an UPDATE trigger on table TABLEX” 相关考题
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