一、表

#1.给表加注释
COMMENT ON TABLE SYS_JOB IS '任务调度表';#2.查看表的COMMENT
SELECT * FROM USER_TAB_COMMENTS WHERE TABLE_NAME='TABLENAME';
例如：
SELECT * FROM USER_TAB_COMMENTS WHERE TABLE_NAME='SYS_JOB';

二、字段

# 1.给字段加注释
COMMENT ON COLUMN SYS_JOB.JOB_NAME IS '任务编码';
COMMENT ON COLUMN SYS_JOB.JOB_NAME IS '任务名称';# 2.查看字段的COMMENT
SELECT * FROM USER_COL_COMMENTS WHERE TABLE_NAME='SYS_JOB';