Defining a Relation Schema in SQL

Now we shall begin a discussion of data definition, the portions of SQL that involve explaining the structure of information in the database. On the contrary, the aspects of SQL discussed previously - queries and modifications - are often called data manipulation.

Branching Statements

For our first complicated PSM statement type, let us examine the if-statement. The form is only a little strange; it is different from C or similar languages in that:

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