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今天考数据库,这是题目和我的答案![14]

[入库：2005年8月18日] [更新：2007年3月24日]

本文简介：选择自 soaktech 的 blog
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 (a) roll all the updates (including inserts, deletes, modifications) of an aborted transaction into the database
 (b) roll only the inserts and deletes of an aborted transaction into the database
 (c) discard all the updates (including inserts, deletes, modifications) of a transaction from the database
 (d) discard only the inserts and updates of a transaction from the database

 

 

 

20.

 

when a string whose length is strictly less than n is entered as the value of a field whose sql data type is char(n), the system responds by

 

 

 

 (a) padding the end of the string with spaces to length n before storing it
 (b) padding the end of the string with null characters to length n before storing it
 (c) re-prompting for the entry of a string whose length is exactly n
 (d) storing the string as is

 

 


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