1. SQLZOO
SELECT basics
使用table如下: #1
The example uses a WHERE clause to show the population of France. Note that strings (pieces of text that are data) should be in single quotes;
Modify it to show the population of Germany:
SELECT po…
数据表:world
namecontinentareapopulationgdpAfghanistanAsia6522302550010020343000000AlbaniaEurope28748283174112960000000AlgeriaAfrica238174137100000188681000000AndorraEurope468781153712000000AngolaAfrica124670020609294100990000000... Q1 Total wo…
SQLZOO练习笔记
在练习过程中,首次出现的语法记录下来,备忘。练习中基础语句的嵌套使用就不在此记录,多练才是王道~
1. Basic
SELCET name, population FROM world
WHERE name Germany;
WHERE name IN (Ireland,Iceland);
WHERE area …