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多选题
You need to replicate a table from a master to a slave. The master and slave copies of the table will have different number of columns. Which two conditions must be true?()
A

Each extra column in the copy with more columns must not have a default value

B

Columns that are common to both versions of the table must be defined in the same order on the master and the slave

C

The slave database cannot have more columns than the master. Only the master database can have more columns

D

Columns that are common to both versions of the table must come first in the table definition, before any additional columns are additional columns are defined on either server

E

The master database cannot have more columns than the slave. Only the slave deatbase can have more columns


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