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摘要: 1. 更新. select * from dept for update; 2.count(*) 3. select * from dual; 4. select * from emp; 1 7369 SMITH CLERK 7902 1980/12/17 800.00 20 2 7499 ALLE 阅读全文
posted @ 2020-10-03 17:44 萌哥-爱学习 阅读(130) 评论(0) 推荐(0) 编辑