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    Error updating primary drop

    I'll try to address the foreign keys first, since you question asked about them :) But before that, we should realize that the two sets of tables (the first three you created and the second set, which you created after dropping the first set) are the same.

    Of course, the definition of CREATE TABLE table3 ( "ID" bigint NOT NULL DEFAULT '0', "Data ID" bigint DEFAULT NULL, "Address" numeric(20) DEFAULT NULL, "Data" bigint DEFAULT NULL, PRIMARY KEY ("ID"), FOREIGN KEY ("Data ID") REFERENCES Table1("Data ID") on delete cascade on update cascade, FOREIGN KEY ("Address") REFERENCES Table2("Address") on delete cascade on update cascade ); . The column name and the data type suggests that this address can change in the future.

    External tables must be qualified by an external schema name.

    You cannot rename a permanent table to a name that begins with '#'.

    A table name beginning with '#' indicates a temporary table.

    Following is one demo on small sample table: Let us say, we have a table CON with primary key in ID column.

    SQL select * from con; ID NAME CITY SALARY---------- -------------------- ---------- ---------- 10 ABC B 1000 11 XYZ C 2000 13 DIFF 1 12 SOME 2000Let us disable the primary key, assuming constraint name of primary key in ID column is CON_PR.

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