oracle sql语句笔记

Oracle Sql 笔记 1.起别名的时候双引号能够保证名称就是引号内内容 2. || 链接 SELECT LastName || Id AS AAA FROM employ; 3.Distinct 消除重复行 4.escape 转义 select * from t_char where a like ‘%%%’ escape ‘’ 5.order by 排序 desc 降序 asc 升序web

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