sql語句主要用到以下幾點：
1. group_concat 用來將分組之後的專案拼接在一起，用逗號隔開。
3. 多個 select 巢狀。
4. 查詢結果欄位起別名...
sql語句
select ('') as last from (select group_concat(items) as itemtog from (select ('"'||province||'":') as items from (select group_concat(cityareas) as cityoutput,province from (select ('"'||bbb.cityname||'":'||bbb.aa) as cityareas,cityid,father from (select aaa.aa as aa,hat_city.cityid as cityid , hat_city.city as cityname ,hat_city.father as father from (select ("[" || a.allarea || "]") as aa , cityid from (select father as cityid,group_concat(area) as allarea from (select hat_area.father as father, ('"'||hat_area.area||'"') as area from hat_area) group by father) as a) as aaa , hat_city where aaa.cityid = hat_city.cityid) as bbb) as bkbk, hat_province where bkbk.father = hat_province.provinceid group by provinceid) as citysout) as output)create table hat_area (
id int(11) not null auto_increment,
areaid varchar(6) default null,
area varchar(60) default null,
father varchar(6) default null,
primary key(id)
) engine=myisam auto_increment=3145 default charset=utf8;
create table hat_city (
id int(11) not null auto_increment,
cityid varchar(6) default null,
city varchar(50) default null,
father varchar(6) default null,
primary key (id)
) engine=myisam auto_increment=346 default charset=utf8;
create table hat_province (
id int(11) not null auto_increment,
provinceid varchar(6) default null,
province varchar(40) default null,
primary key (id)
) engine=myisam auto_increment=35 default charset=utf8;
執行sql的查詢結果
,
"天津市": ,
"河北省": ,
"山西省": ,
"內蒙古自治區": ,
"遼寧省": ,
"吉林省": ,
"黑龍江省": ,
"上海市": ,
"江蘇省": ,
"浙江省": ,
"安徽省": ,
"福建省": ,
"江西省": ,
"山東省": ,
"河南省": ,
"湖北省": ,
"湖南省": ,
"廣東省": ,
"廣西壯族自治區": ,
"海南省": ,
"重慶市": ,
"四川省": ,
"貴州省": ,
"雲南省": ,
"**自治區": ,
"陝西省": ,
"甘肅省": ,
"青海省": ,
"寧夏回族自治區": ,
"新疆維吾爾自治區":
}
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