摘要:
字符函数 select concat('a','b')from dual;//concat 拼接;dual oracle中虚表。不存在的 select 'a'||'b' from dual//与concat拼接等价 select concat('a','b','c')from dual concat 阅读全文
posted @ 2023-07-04 19:51 liuxin6de1b 阅读(16) 评论(0) 推荐(0) 编辑
posted @ 2023-07-04 19:51 liuxin6de1b 阅读(16) 评论(0) 推荐(0) 编辑
posted @ 2023-07-04 19:43 liuxin6de1b 阅读(42) 评论(0) 推荐(0) 编辑
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