1、Learn SQL| Codecademy第一節(jié)學(xué)習(xí)筆記
2誉裆、學(xué)習(xí)記錄?Learn SQL| Codecademy 第二節(jié)總結(jié)（原文是網(wǎng)站上的總結(jié)，翻譯是作為英語渣渣自己強行翻譯的葛圃，注釋是自己擴展的知識）
·原文：SELECT is the clause you use every time you want to query information from a database.
·翻譯：SELECT 是你每次想要從數(shù)據(jù)庫中查詢信息時需要用到的語句。
·原文：WHERE is a popular command that lets you filter the results of the query based on conditions that you specify.
·翻譯：WHERE 是一個常用的命令砸烦，讓你能根據(jù)指定的條件篩選查詢結(jié)果。
·原文：LIKE and BETWEEN are special operators that can be used in a WHERE clause
·翻譯：LIKE 和 BETWEEN 是可以用在?WHERE 子句中的指定模式绞吁。
·原文：AND and OR are special operators that you can use with WHERE to filter the query on two or more conditions.
·翻譯：AND 和 OR 可以與WHERE一同使用幢痘，讓你能根據(jù)兩個及以上條件篩選查詢結(jié)果。
·原文：ORDER BY lets you sort the results of the query in either ascending or descending order.
·翻譯：ORDER BY 讓你能將查詢結(jié)果按照升序或者降序排列家破。
·原文：LIMIT lets you specify the maximum number of rows that the query will return. This is especially important in large tables that have thousands or even millions of rows.
·翻譯：LIMIT 讓你明確查詢返回的最大行數(shù)颜说。這在一些有著幾千甚至幾百萬行的數(shù)據(jù)表格中特別重要。
——— END ——
2017年09月22日
