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Problem Entries
uSince you can search on any ID the previous example is not very detrimental, but entering the following is problematic:
u  1)))
u   UNION ALL
u   SELECT NULL, NULL,
u          NULL, first_name || ' ' || last_name || ' ' || street_address,
u          NULL, NULL,
u          NULL, NULL,
u          NULL, NULL,
u          NULL, NULL,
u          NULL, NULL,
u          NULL, NULL
u   FROM USERS
u   WHERE (((1=1