2016.9.27小程序---数据库练习1

  1 -- createbbc, 1, 50
  2 DROP TABLE bbc; 
  3 
  4 
  5 CREATE INDEX bbc_region ON bbc(region);
  6 
  7 GO
  8 -- tabbbc, 1, 50
  9 INSERT INTO bbc VALUES (‘Afghanistan‘,‘South Asia‘,652225,26000000,NULL);
 10 INSERT INTO bbc VALUES (‘Albania‘,‘Europe‘,28728,3200000,6656000000);
 11 INSERT INTO bbc VALUES (‘Algeria‘,‘Middle East‘,2400000,32900000,75012000000);
 12 INSERT INTO bbc VALUES (‘Andorra‘,‘Europe‘,468,64000,NULL);
 13 INSERT INTO bbc VALUES (‘Angola‘,‘Africa‘,1250000,14500000,14935000000);
 14 INSERT INTO bbc VALUES (‘Antigua and Barbuda‘,‘Americas‘,442,77000,770000000);
 15 INSERT INTO bbc VALUES (‘Argentina‘,‘South America‘,2800000,39300000,146196000000);
 16 INSERT INTO bbc VALUES (‘Armenia‘,‘Europe‘,29743,3000000,3360000000);
 17 INSERT INTO bbc VALUES (‘Australia‘,‘Asia-Pacific‘,7700000,20300000,546070000000);
 18 INSERT INTO bbc VALUES (‘Austria‘,‘Europe‘,83871,8100000,261630000000);
 19 INSERT INTO bbc VALUES (‘Azerbaijan‘,‘Europe‘,86600,8500000,NULL);
 20 INSERT INTO bbc VALUES (‘Bahamas‘,‘Americas‘,13939,321000,4789320000);
 21 INSERT INTO bbc VALUES (‘Bahrain‘,‘Middle East‘,717,754000,9357140000);
 22 INSERT INTO bbc VALUES (‘Bangladesh‘,‘South Asia‘,143998,152600000,67144000000);
 23 INSERT INTO bbc VALUES (‘Barbados‘,‘Americas‘,430,272000,2518720000);
 24 INSERT INTO bbc VALUES (‘Belarus‘,‘Europe‘,207595,9800000,20776000000);
 25 INSERT INTO bbc VALUES (‘Belgium‘,‘Europe‘,30528,10300000,319609000000);
 26 INSERT INTO bbc VALUES (‘Belize‘,‘Americas‘,22965,266000,NULL);
 27 INSERT INTO bbc VALUES (‘Benin‘,‘Africa‘,112622,7100000,3763000000);
 28 INSERT INTO bbc VALUES (‘Bhutan‘,‘South Asia‘,38364,2400000,1824000000);
 29 INSERT INTO bbc VALUES (‘Bolivia‘,‘South America‘,1100000,9100000,NULL);
 30 INSERT INTO bbc VALUES (‘Bosnia-Hercegovina‘,‘Europe‘,51129,4200000,8568000000);
 31 INSERT INTO bbc VALUES (‘Botswana‘,‘Africa‘,581730,1800000,7812000000);
 32 INSERT INTO bbc VALUES (‘Brazil‘,‘South America‘,8550000,182800000,564852000000);
 33 INSERT INTO bbc VALUES (‘Brunei‘,‘Asia-Pacific‘,5765,374000,NULL);
 34 INSERT INTO bbc VALUES (‘Bulgaria‘,‘Europe‘,110994,7800000,21372000000);
 35 INSERT INTO bbc VALUES (‘Burkina Faso‘,‘Africa‘,274200,13800000,4968000000);
 36 INSERT INTO bbc VALUES (‘Burma‘,‘Asia-Pacific‘,676552,50700000,NULL);
 37 INSERT INTO bbc VALUES (‘Burundi‘,‘Africa‘,27816,7300000,NULL);
 38 INSERT INTO bbc VALUES (‘Cambodia‘,‘Asia-Pacific‘,181035,14800000,4736000000);
 39 INSERT INTO bbc VALUES (‘Cameroon‘,‘Africa‘,465458,16600000,13280000000);
 40 INSERT INTO bbc VALUES (‘Canada‘,‘North America‘,9900000,32000000,908480000000);
 41 INSERT INTO bbc VALUES (‘Cape Verde‘,‘Africa‘,4033,482000,853140000);
 42 INSERT INTO bbc VALUES (‘Central African Republic‘,‘Africa‘,622984,3900000,NULL);
 43 INSERT INTO bbc VALUES (‘Chad‘,‘Africa‘,1280000,9100000,2366000000);
 44 INSERT INTO bbc VALUES (‘Chile‘,‘South America‘,756096,16200000,79542000000);
 45 INSERT INTO bbc VALUES (‘China‘,‘Asia-Pacific‘,9600000,1300000000,1677000000000);
 46 INSERT INTO bbc VALUES (‘Colombia‘,‘South America‘,1140000,45600000,NULL);
 47 INSERT INTO bbc VALUES (‘Comoros‘,‘Africa‘,1862,812000,NULL);
 48 INSERT INTO bbc VALUES (‘Costa Rica‘,‘Americas‘,51100,4300000,NULL);
 49 INSERT INTO bbc VALUES (‘Croatia‘,‘Europe‘,56594,4400000,28996000000);
 50 INSERT INTO bbc VALUES (‘Cuba‘,‘Americas‘,110860,11300000,NULL);
 51 INSERT INTO bbc VALUES (‘Cyprus‘,‘Europe‘,9250,807000,14187060000);
 52 INSERT INTO bbc VALUES (‘Czech Republic‘,‘Europe‘,78866,10200000,93330000000);
 53 INSERT INTO bbc VALUES (‘Democratic Republic of Congo‘,‘Africa‘,2340000,56000000,6720000000);
 54 INSERT INTO bbc VALUES (‘Denmark‘,‘Europe‘,43098,5400000,219510000000);
 55 INSERT INTO bbc VALUES (‘Djibouti‘,‘Africa‘,23200,721000,NULL);
 56 INSERT INTO bbc VALUES (‘Dominica‘,‘Americas‘,751,71000,259150000);
 57 INSERT INTO bbc VALUES (‘Dominican Republic‘,‘Americas‘,48072,9000000,NULL);
 58 INSERT INTO bbc VALUES (‘East Timor‘,‘Asia-Pacific‘,14609,857000,NULL);
 59 -- tabbbc, 51, 50
 60 INSERT INTO bbc VALUES (‘Ecuador‘,‘South America‘,272045,13400000,NULL);
 61 INSERT INTO bbc VALUES (‘Egypt‘,‘Middle East‘,1000000,74900000,98119000000);
 62 INSERT INTO bbc VALUES (‘El Salvador‘,‘Americas‘,21041,6700000,15745000000);
 63 INSERT INTO bbc VALUES (‘Equatorial Guinea‘,‘Africa‘,28051,521000,484530000);
 64 INSERT INTO bbc VALUES (‘Eritrea‘,‘Africa‘,117400,4561599,NULL);
 65 INSERT INTO bbc VALUES (‘Estonia‘,‘Europe‘,45227,1300000,9113000000);
 66 INSERT INTO bbc VALUES (‘Ethiopia‘,‘Africa‘,1130000,74200000,8162000000);
 67 INSERT INTO bbc VALUES (‘Fiji‘,‘Asia-Pacific‘,18376,854000,NULL);
 68 INSERT INTO bbc VALUES (‘Finland‘,‘Europe‘,338145,5200000,170508000000);
 69 INSERT INTO bbc VALUES (‘Former Yugoslav Republic of Macedonia‘,‘Europe‘,25713,2000000,4700000000);
 70 INSERT INTO bbc VALUES (‘France‘,‘Europe‘,543965,60700000,1826463000000);
 71 INSERT INTO bbc VALUES (‘Gabon‘,‘Africa‘,267667,1400000,NULL);
 72 INSERT INTO bbc VALUES (‘Georgia‘,‘Europe‘,69700,5000000,5200000000);
 73 INSERT INTO bbc VALUES (‘Germany‘,‘Europe‘,357027,82500000,2484900000000);
 74 INSERT INTO bbc VALUES (‘Ghana‘,‘Africa‘,238533,21800000,8284000000);
 75 INSERT INTO bbc VALUES (‘Greece‘,‘Europe‘,131957,11000000,182710000000);
 76 INSERT INTO bbc VALUES (‘Grenada‘,‘Americas‘,344,103000,NULL);
 77 INSERT INTO bbc VALUES (‘Guatemala‘,‘Americas‘,108890,13000000,NULL);
 78 INSERT INTO bbc VALUES (‘Guinea‘,‘Africa‘,245857,8800000,4048000000);
 79 INSERT INTO bbc VALUES (‘Guinea-Bissau‘,‘Africa‘,36125,1600000,256000000);
 80 INSERT INTO bbc VALUES (‘Guyana‘,‘South America‘,214969,768000,NULL);
 81 INSERT INTO bbc VALUES (‘Haiti‘,‘Americas‘,27750,8500000,NULL);
 82 INSERT INTO bbc VALUES (‘Honduras‘,‘Americas‘,112492,7200000,7416000000);
 83 INSERT INTO bbc VALUES (‘Hungary‘,‘Europe‘,93030,9800000,81046000000);
 84 INSERT INTO bbc VALUES (‘Iceland‘,‘Europe‘,103000,294000,11354280000);
 85 INSERT INTO bbc VALUES (‘India‘,‘South Asia‘,3100000,1100000000,682000000000);
 86 INSERT INTO bbc VALUES (‘Indonesia‘,‘Asia-Pacific‘,1900000,225300000,256842000000);
 87 INSERT INTO bbc VALUES (‘Iran‘,‘Middle East‘,1650000,70700000,162610000000);
 88 INSERT INTO bbc VALUES (‘Iraq‘,‘Middle East‘,438317,26500000,NULL);
 89 INSERT INTO bbc VALUES (‘Ireland‘,‘Europe‘,70182,4000000,137120000000);
 90 INSERT INTO bbc VALUES (‘Israel and Palestinian territories‘,‘Middle East‘,20770,3800000,4256000000);
 91 INSERT INTO bbc VALUES (‘Italy‘,‘Europe‘,301338,57200000,1494064000000);
 92 INSERT INTO bbc VALUES (‘Ivory Coast‘,‘Africa‘,322462,17100000,13167000000);
 93 INSERT INTO bbc VALUES (‘Jamaica‘,‘Americas‘,10991,2700000,7830000000);
 94 INSERT INTO bbc VALUES (‘Japan‘,‘Asia-Pacific‘,377864,127900000,4755322000000);
 95 INSERT INTO bbc VALUES (‘Jordan‘,‘Middle East‘,89342,5700000,12198000000);
 96 INSERT INTO bbc VALUES (‘Kazakhstan‘,‘Asia-Pacific‘,2700000,15400000,NULL);
 97 INSERT INTO bbc VALUES (‘Kenya‘,‘Africa‘,582646,32800000,15088000000);
 98 INSERT INTO bbc VALUES (‘Kiribati‘,‘Asia-Pacific‘,810,85000,82450000);
 99 INSERT INTO bbc VALUES (‘Kuwait‘,‘Middle East‘,17818,2700000,48519000000);
100 INSERT INTO bbc VALUES (‘Kyrgyzstan‘,‘Asia-Pacific‘,199900,5300000,NULL);
101 INSERT INTO bbc VALUES (‘Laos‘,‘Asia-Pacific‘,236800,5900000,2301000000);
102 INSERT INTO bbc VALUES (‘Latvia‘,‘Europe‘,64589,2300000,NULL);
103 INSERT INTO bbc VALUES (‘Lebanon‘,‘Middle East‘,10452,3800000,18924000000);
104 INSERT INTO bbc VALUES (‘Lesotho‘,‘Africa‘,30355,1800000,1332000000);
105 INSERT INTO bbc VALUES (‘Liberia‘,‘Africa‘,99067,3600000,396000000);
106 INSERT INTO bbc VALUES (‘Libya‘,‘Africa‘,1770000,5800000,25810000000);
107 INSERT INTO bbc VALUES (‘Liechtenstein‘,‘Europe‘,160,34000,NULL);
108 INSERT INTO bbc VALUES (‘Lithuania‘,‘Europe‘,65300,3400000,19516000000);
109 INSERT INTO bbc VALUES (‘Luxembourg‘,‘Europe‘,2586,465000,26146950000);
110 -- tabbbc, 101, 50
111 INSERT INTO bbc VALUES (‘Madagascar‘,‘Africa‘,587041,18400000,5520000000);
112 INSERT INTO bbc VALUES (‘Malawi‘,‘Africa‘,118484,12600000,2142000000);
113 INSERT INTO bbc VALUES (‘Malaysia‘,‘Asia-Pacific‘,329847,25300000,NULL);
114 INSERT INTO bbc VALUES (‘Mali‘,‘Africa‘,1250000,13800000,4968000000);
115 INSERT INTO bbc VALUES (‘Malta‘,‘Europe‘,316,397000,4863250000);
116 INSERT INTO bbc VALUES (‘Marshall Islands‘,‘Asia-Pacific‘,181,57000,135090000);
117 INSERT INTO bbc VALUES (‘Mauritania‘,‘Middle East‘,1040000,3100000,1302000000);
118 INSERT INTO bbc VALUES (‘Mauritius‘,‘Africa‘,2040,1200000,5568000000);
119 INSERT INTO bbc VALUES (‘Mexico‘,‘North America‘,1960000,106400000,720328000000);
120 INSERT INTO bbc VALUES (‘Micronesia‘,‘Asia-Pacific‘,700,111000,NULL);
121 INSERT INTO bbc VALUES (‘Moldova‘,‘Europe‘,33800,4300000,3053000000);
122 INSERT INTO bbc VALUES (‘Monaco‘,‘Europe‘,2,32000,NULL);
123 INSERT INTO bbc VALUES (‘Mongolia‘,‘Asia-Pacific‘,1560000,2700000,NULL);
124 INSERT INTO bbc VALUES (‘Morocco‘,‘Middle East‘,710850,31600000,48032000000);
125 INSERT INTO bbc VALUES (‘Mozambique‘,‘Africa‘,812379,19500000,4875000000);
126 INSERT INTO bbc VALUES (‘Namibia‘,‘Africa‘,824292,2000000,4740000000);
127 INSERT INTO bbc VALUES (‘Nauru‘,‘Asia-Pacific‘,21,9900,NULL);
128 INSERT INTO bbc VALUES (‘Nepal‘,‘South Asia‘,147181,26300000,6838000000);
129 INSERT INTO bbc VALUES (‘New Zealand‘,‘Asia-Pacific‘,270534,4000000,81240000000);
130 INSERT INTO bbc VALUES (‘Nicaragua‘,‘Americas‘,120254,5700000,4503000000);
131 INSERT INTO bbc VALUES (‘Niger‘,‘Africa‘,1270000,12900000,2967000000);
132 INSERT INTO bbc VALUES (‘Nigeria‘,‘Africa‘,923768,130200000,50778000000);
133 INSERT INTO bbc VALUES (‘North Korea‘,‘Asia-Pacific‘,122762,22900000,NULL);
134 INSERT INTO bbc VALUES (‘Norway‘,‘Europe‘,323759,4600000,239338000000);
135 INSERT INTO bbc VALUES (‘Oman‘,‘Middle East‘,309500,3000000,23670000000);
136 INSERT INTO bbc VALUES (‘Pakistan‘,‘South Asia‘,796095,161100000,96660000000);
137 INSERT INTO bbc VALUES (‘Palau‘,‘Asia-Pacific‘,508,20000,NULL);
138 INSERT INTO bbc VALUES (‘Panama‘,‘Americas‘,75517,3200000,NULL);
139 INSERT INTO bbc VALUES (‘Papua New Guinea‘,‘Asia-Pacific‘,462840,5900000,3422000000);
140 INSERT INTO bbc VALUES (‘Paraguay‘,‘South America‘,406752,6200000,NULL);
141 INSERT INTO bbc VALUES (‘Peru‘,‘South America‘,1280000,28000000,NULL);
142 INSERT INTO bbc VALUES (‘Poland‘,‘Europe‘,312685,38500000,234465000000);
143 INSERT INTO bbc VALUES (‘Portugal‘,‘Europe‘,92345,10500000,150675000000);
144 INSERT INTO bbc VALUES (‘Qatar‘,‘Middle East‘,11437,628000,NULL);
145 INSERT INTO bbc VALUES (‘Republic of Congo‘,‘Africa‘,342000,3039126,NULL);
146 INSERT INTO bbc VALUES (‘Romania‘,‘Europe‘,238391,22200000,64824000000);
147 INSERT INTO bbc VALUES (‘Russia‘,‘Europe‘,17000000,141500000,482515000000);
148 INSERT INTO bbc VALUES (‘Rwanda‘,‘Africa‘,26338,8600000,1892000000);
149 INSERT INTO bbc VALUES (‘Samoa‘,‘Asia-Pacific‘,2831,182000,NULL);
150 INSERT INTO bbc VALUES (‘San Marino‘,‘Europe‘,61,27000,NULL);
151 INSERT INTO bbc VALUES (‘Sao Tome and Principe‘,‘Africa‘,1001,169000,62530000);
152 INSERT INTO bbc VALUES (‘Saudi Arabia‘,‘Middle East‘,2240000,25600000,267008000000);
153 INSERT INTO bbc VALUES (‘Senegal‘,‘Africa‘,196722,10600000,7102000000);
154 INSERT INTO bbc VALUES (‘Serbia and Montenegro‘,‘Europe‘,102173,10500000,27510000000);
155 INSERT INTO bbc VALUES (‘Seychelles‘,‘Africa‘,455,76000,NULL);
156 INSERT INTO bbc VALUES (‘Sierra Leone‘,‘Africa‘,71740,5300000,1060000000);
157 INSERT INTO bbc VALUES (‘Singapore‘,‘Asia-Pacific‘,660,4400000,106568000000);
158 INSERT INTO bbc VALUES (‘Slovakia‘,‘Europe‘,49033,5400000,34992000000);
159 INSERT INTO bbc VALUES (‘Slovenia‘,‘Europe‘,20273,2000000,29620000000);
160 INSERT INTO bbc VALUES (‘Solomon Islands‘,‘Asia-Pacific‘,27556,504000,277200000);
161 -- tabbbc, 151, 50
162 INSERT INTO bbc VALUES (‘Somalia‘,‘Africa‘,637657,10700000,NULL);
163 INSERT INTO bbc VALUES (‘South Africa‘,‘Africa‘,1220000,45300000,164439000000);
164 INSERT INTO bbc VALUES (‘South Korea‘,‘Asia-Pacific‘,99313,48200000,673836000000);
165 INSERT INTO bbc VALUES (‘Spain‘,‘Europe‘,505988,44100000,935361000000);
166 INSERT INTO bbc VALUES (‘Sri Lanka‘,‘South Asia‘,65610,19400000,19594000000);
167 INSERT INTO bbc VALUES (‘St Kitts and Nevis‘,‘Americas‘,269,46000,NULL);
168 INSERT INTO bbc VALUES (‘St Lucia‘,‘Americas‘,616,152000,655120000);
169 INSERT INTO bbc VALUES (‘St Vincent and the Grenadines‘,‘Americas‘,389,121000,441650000);
170 INSERT INTO bbc VALUES (‘Sudan‘,‘Middle East‘,2500000,35000000,18550000000);
171 INSERT INTO bbc VALUES (‘Surinam‘,‘South America‘,163265,442000,NULL);
172 INSERT INTO bbc VALUES (‘Swaziland‘,‘Africa‘,17364,1100000,1826000000);
173 INSERT INTO bbc VALUES (‘Sweden‘,‘Europe‘,449964,8900000,318353000000);
174 INSERT INTO bbc VALUES (‘Switzerland‘,‘Europe‘,41284,7100000,342433000000);
175 INSERT INTO bbc VALUES (‘Syria‘,‘Middle East‘,185180,18600000,22134000000);
176 INSERT INTO bbc VALUES (‘Taiwan‘,‘Asia-Pacific‘,36188,22700000,302364000000);
177 INSERT INTO bbc VALUES (‘Tajikistan‘,‘Asia-Pacific‘,143100,6300000,NULL);
178 INSERT INTO bbc VALUES (‘Tanzania‘,‘Africa‘,945087,38400000,NULL);
179 INSERT INTO bbc VALUES (‘Thailand‘,‘Asia-Pacific‘,513115,64100000,162814000000);
180 INSERT INTO bbc VALUES (‘The Gambia‘,‘Africa‘,11295,1500000,NULL);
181 INSERT INTO bbc VALUES (‘The Maldives‘,‘South Asia‘,298,338000,848380000);
182 INSERT INTO bbc VALUES (‘The Netherlands‘,‘Europe‘,41864,16300000,516710000000);
183 INSERT INTO bbc VALUES (‘The Philippines‘,‘Asia-Pacific‘,300000,82800000,96876000000);
184 INSERT INTO bbc VALUES (‘Togo‘,‘Africa‘,56785,5100000,1938000000);
185 INSERT INTO bbc VALUES (‘Tonga‘,‘Asia-Pacific‘,748,106000,NULL);
186 INSERT INTO bbc VALUES (‘Trinidad and Tobago‘,‘Americas‘,5128,1300000,NULL);
187 INSERT INTO bbc VALUES (‘Tunisia‘,‘Middle East‘,164150,10000000,26300000000);
188 INSERT INTO bbc VALUES (‘Turkey‘,‘Europe‘,779452,73300000,274875000000);
189 INSERT INTO bbc VALUES (‘Turkmenistan‘,‘Asia-Pacific‘,488100,5000000,NULL);
190 INSERT INTO bbc VALUES (‘Tuvalu‘,‘Asia-Pacific‘,26,10000,NULL);
191 INSERT INTO bbc VALUES (‘Uganda‘,‘Africa‘,241038,27600000,7452000000);
192 INSERT INTO bbc VALUES (‘Ukraine‘,‘Europe‘,603700,47800000,60228000000);
193 INSERT INTO bbc VALUES (‘United Arab Emirates‘,‘Middle East‘,77700,3100000,NULL);
194 INSERT INTO bbc VALUES (‘United Kingdom‘,‘Europe‘,242514,59600000,2022824000000);
195 INSERT INTO bbc VALUES (‘United States of America‘,‘North America‘,9800000,295000000,12213000000000);
196 INSERT INTO bbc VALUES (‘Uruguay‘,‘South America‘,176215,3500000,NULL);
197 INSERT INTO bbc VALUES (‘Uzbekistan‘,‘Asia-Pacific‘,447400,26900000,NULL);
198 INSERT INTO bbc VALUES (‘Vanuatu‘,‘Asia-Pacific‘,12190,222000,297480000);
199 INSERT INTO bbc VALUES (‘Vatican‘,‘Europe‘,0,NULL,NULL);
200 INSERT INTO bbc VALUES (‘Venezuela‘,‘South America‘,881050,26600000,NULL);
201 INSERT INTO bbc VALUES (‘Vietnam‘,‘Asia-Pacific‘,329247,83600000,45980000000);
202 INSERT INTO bbc VALUES (‘Yemen‘,‘Middle East‘,536869,21500000,12255000000);
203 INSERT INTO bbc VALUES (‘Zambia‘,‘Africa‘,752614,11000000,4950000000);
204 INSERT INTO bbc VALUES (‘Zimbabwe‘,‘Africa‘,390759,12900000,6192000000);
205 
206 
207 SELECT * FROM bbc
208 CREATE TABLE bbc(
209    NAME VARCHAR(50) NOT NULL
210    ,region VARCHAR(60)
211    ,AREA DECIMAL(10)         
212    ,population DECIMAL(11)    
213    ,gdp DECIMAL(14)        
214    ,PRIMARY KEY (NAME)
215    );
216 -- 获得到和‘ Brazil’同属一个地区的所有国家
217 SELECT * FROM bbc WHERE region = (SELECT region FROM bbc WHERE NAME=‘Brazil‘)
218 
219 -- 给出人口多于Russia的国家名称
220 SELECT NAME FROM bbc WHERE population > (SELECT population FROM bbc WHERE  NAME=‘Russia‘)
221 
222 -- 给出‘India‘,‘Iran‘所在地区的所有国家信息
223 SELECT * FROM bbc  WHERE region IN (SELECT region FROM bbc WHERE NAME=‘India‘ OR NAME=‘Iran‘)
224 
225 -- 给出人均gdp超过‘United Kingdom‘(英国)的欧州国家
226 SELECT * FROM bbc WHERE gdp > (SELECT gdp FROM bbc WHERE NAME=‘United Kingdom‘)
227 
228 -- 给出人口比‘Canada‘多但少于Algeria的国家的信息
229 SELECT * FROM bbc WHERE population > (SELECT population FROM bbc WHERE NAME=‘Canada‘) AND population <(SELECT population FROM bbc WHERE NAME=‘Algeria‘)
230 
231 -- 给出gdp比任何欧州国家都多的国家
232 SELECT NAME FROM bbc WHERE gdp > (SELECT MAX(gdp) FROM bbc WHERE region =‘Europe‘)
233 
234 -- 给出每个地区人口最大的国家
235 SELECT NAME,region FROM bbc WHERE  population IN (SELECT MAX(population) FROM bbc GROUP BY region)
236 
237 -- 给出地区中所有国家的人口总数为0的地区
238 SELECT region,SUM(population) FROM bbc GROUP BY region HAVING SUM(population) = 0
239 
240 -- 有些国家的人口数比她的周边国家要多三倍，请列出这些国家和地区。
241 SELECT NAME,region FROM bbc b WHERE population >4*(
242 SELECT MAX(population)  FROM bbc c WHERE c.region = b.region AND c.NAME != b.NAME )