ORA-14419：DROP CONSTRAINT ONLINE does not support the CASCADE option.
错误码
错误描述：DROP CONSTRAINT ONLINE does not support the CASCADE option.
错误原因：An attempt was made to use the CASCADE option with DROP CONSTRAINT ONLINE statement.
解决方法：Using the CASCADE option with the DROP CONSTRAINT ONLINE statement is illegal. Remove the CASCADE keyword from the statement. Drop the child key constraint in a separate DROP CONSTRAINT ONLINE statement on the child table.
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