初級sql select語法
sql select語法是sql語言中最基礎的語法,下面就將為您介紹sql select語法,供您參考,如果您是才接觸SQL數據庫的新手,不妨一看,相信對您學習sql select語法會有所幫助。
SQL查詢: SELECT
普通查詢:
SELECT "欄位名" FROM "表格名"
DISTINCT 查詢:(去掉重復)
SELECT DISTINCT "欄位名" FROM "表格名"
WHERE 條件查詢:
SELECT "欄位名" FROM "表格名" WHERE "條件"
AND 或是 OR 多條件查詢:
SELECT "欄位名" FROM "表格名" WHERE "簡單條件" {[AND|OR] "簡單條件"}+ {}+代表{}之內的情況會發生一或多次。在這里的意思就是 AND 加簡單條件及 OR加簡單條件的情況可以發生一或多次。另外,我們可以用 () 來代表條件的先后次序。
IN 查詢:
SELECT "欄位名" FROM "表格名" WHERE "欄位名" IN ('值一', '值二', ...)
BETWEEN 查詢:
SELECT "欄位名" FROM " 表格名" WHERE "欄位名" BETWEEN '值一' AND '值二'
LIKE 查詢:(模糊查詢)
SELECT "欄位名" FROM "表格名" WHERE "欄位名" LIKE {套式}
ORDER BY 查詢:(排序)
SELECT "欄位名" FROM "表格名" [WHERE "條件"] ORDER BY "欄位名" [ASC, DESC]
SELECT store_name, Sales, Date FROM Store_Information ORDER BY 2 DESC
這兩句效果相同!
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