此為自用

查詢語句

1.select

SELECT column1,column2 FROM table1;

常用的格式慣例：

大寫了SELECT和FROM，而將表名和列名小寫；

通常在列名中使用下劃線，避免使用空格；

在每個語句末尾添加分號；

SQL不區(qū)分大小寫。

2.limit

SELECT name,director FROM movies LIMIT 15;

3.order by

SELECT name, FROM,film_year,ticket_price FROM movies ORDER BY film_year DESC,ticket_price DESC LIMIT 5;

DESC是倒序

4.where

用在order by之前

SELECT name,film_year FROM movies WHERE name = '哈利波特' ORDER BY film_year;

5.派生列

假如表movies里沒有列count、country

SELECT film_year,ticket_price,film_year/ticket_price AS count'England'AS country FROM movies WHERE name = '哈利波特' ORDER BY film_year LIMIT 5;

邏輯運算符

1.like.

SELECT name FROM movies WHERE name LIKE '%哈利%';

2.in.

SELECT name,director FROM movies WHERE name IN ('哈利波特','魔戒');

3.not.

SELECT name FROM movies WHERE name NOT LIKE '哈利%';SELECT name,director FROM movies WHERE name NOT IN ('哈利波特','魔戒');

4.and 與 between

SELECT name, director FROM movies WHERE film_year = 2000 and name = '哈利波特';SELECT name,director FROM movies WHERE film_day NOT BETWEEN 2000-01-01 AND 2010-01-01;

between包含端點值，但對于時間2010-01-01是2010-01-01 0:00:00

5.or.

SELECT name,director FROM movies WHERE (film_year = 2000 OR film_year = 2010) AND name = '哈利波特' ORDER BY film_year;

總結

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