mysql語句應用 Mysql語句與應用

1。正規表示式

select * from analysis_result where result regexp '上海|內蒙古' limit 1;

"且"select * from analysis_result where id = 1 and result regexp '上海' and result regexp '雲南' limit 1;

select * from analysis_result where id = 1 and result like '%上海%' and result like '%雲南%' limit 1;

2.替換字串

將"3g"替換成"mobile"

update analysis_result set result=replace(result,'3g','mobile') where result_type = 'pcnum'；

3.betweeen and 與 >= ，決不能等同於 in

select count(1) from default.user where univname regexp '上海' and univyear between 2011 and 2013;

select count(1) from default.user where univname regexp '上海' and univyear >= 2011 and univyear <= 2013;

不同於下面

select count(1) from default.user where univname regexp '上海' and univyear in (2010, 2013);

select a.collegename, a.allcount from (select collegename, count(id) as allcount from default.user where collegename != '\n' group by collegename) a sort by a.allcount desc

5.資料顯示 \n 的值，需要用 = '\\n' 去查詢，非的時候就用 != '\n'

insert overwrite local directory '/tmp/result.txt' select id,name from t_test;

hive -e "select count(id), friendcount from default.user where id > 0 and birthday != '\\n' group by friendcount" > friendcount.txt

hive -e "select * from default.user where id > 0 and birthday != '\\n' group by friendcount limit 10000" > user.txt

需要特別指出的是，在篩選某些時間欄位的時候，\n仍會被篩選進來

如下面會把 \n曬進來

select * from user where regtime > '2014-01-01' limit 10

所以應該

select * from user where regtime != '\\n' and regtime > '2014-01-01' limit 10;

6.分組後排序

select a.univname, a.allcount from (select univname, count(id) as allcount from default.user where univname != '\n' group by univname) a sort by a.allcount desc

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