初级sql select语法 |
本文标签:sql select语法 sql select语法是sql语言中最基础的语法,下面就将为您介绍sql select语法,供您参考,如果您是才接触SQL数据库的新手,不妨一看,相信对您学习sql select语法会有所帮助 。 SQL查询: SELECT 普通查询: SELECT "栏位名" FROM "表格名" DISTINCT 查询:(去掉重复) SELECT DISTINCT "栏位名" FROM "表格名" WHERE 条件查询: SELECT "栏位名" FROM "表格名" WHERE "条件" AND 或是 OR 多条件查询: SELECT "栏位名" FROM "表格名" WHERE "简单条件" {[AND|OR] "简单条件"}+ {}+代表{}之内的情况会发生一或多次 。在这里的意思就是 AND 加简单条件及 OR加简单条件的情况可以发生一或多次 。另外,我们可以用 () 来代表条件的先后次序 。 IN 查询: SELECT "栏位名" FROM "表格名" WHERE "栏位名" IN (值一, 值二, ...) BETWEEN 查询: SELECT "栏位名" FROM " 表格名" WHERE "栏位名" BETWEEN 值一 AND 值二 LIKE 查询:(模糊查询) SELECT "栏位名" FROM "表格名" WHERE "栏位名" LIKE {套式} ORDER BY 查询:(排序) SELECT "栏位名" FROM "表格名" [WHERE "条件"] ORDER BY "栏位名" [ASC, DESC] SELECT store_name, Sales, Date FROM Store_Information ORDER BY 2 DESC 这两句效果相同!
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