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!