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Checking delete statement

In case of DELETE statement the algorithm works the same like for UPDATE with exclusion of step 3 (DELETE statement is executed on the whole record and the columns are not checked).

The symbolic schema of modifying database content is shown on the Figure 1.3.

Figure 1.3: Modifying the database content
\includegraphics[scale=1]{modifingdata.eps}

All modifying query (insert,update,delete) are managed by the metauser (see [*]).



Marek Imialek 2006-06-22