单选题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?（）ADefine the column MAINID as NOT UPDATABLEBDefine the column MAINID as a PRIMARY KEYCDefine the column MAINID as a FOREIGN KEYDDefine an UPDATE trigger on table TABLEX
单选题
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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