An & prefix to an undefined substitution variable, which is referenced twice in the same query, will prompt for a value twice .
The && prefix will not prompt for a value even if the substitution variable is not previously defined in the session.
An && prefix to an undefined substitution variable, which is referenced multiple times in multiple queries, will prompt for a value once per query.
A FOREIGN KEY column in a child table and the referenced PRIMARY KEY column in the parenttable must have the same names.
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