ORA-01792 maximum number of columns in a table or view is 1000
Cause: An attempt was made to create a table or view with more than 1000 columns, or to add more columns to a table or view which pushes it over the maximum allowable limit of 1000. Note that unused columns in the table are counted toward the 1000 column limit.
Action: If the error is a result of a CREATE command, then reduce the number of columns in the command and resubmit. If the error is a result of an ALTER TABLE command, then there are two options:
* If the table contained unused columns, remove them by executing ALTER TABLE DROP UNUSED COLUMNS before adding new columns.
* Reduce the number of columns in the command and resubmit.
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Popularity: 26% [?]

今天用户运行查询语句的时候遇到了Ora-01775错误，查看了一下帮助得到如下解释：

ORA-01775 looping chain of synonyms
Cause: Through a series of CREATE synonym statements, a synonym was defined that referred to itself. For example, the following definitions are circular:
CREATE SYNONYM s1 for s2
CREATE SYNONYM s2 for s3
CREATE SYNONYM s3 for s1
Action: Change one synonym definition so that it applies to a base table or view and retry the operation.
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Popularity: 24% [?]