sql - triggers in new and old columns -

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Why can not we use: New and: trigger the old column in a statement level?

Because this case may be that the statement is inserting / removing / updating more than one line There is no new or old column.

Example: 

  Update FOO set one = 12 where b = 9; Remove

or: 

  from FOO where b = 9;

Or: 

  Put in FOO (A, B) Select X to X, X to X;

If a statement is triggered in the FOO table, then no one in these three sentences can tell whether you have a single, single or multiple lines Are working on


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