如果满足某一条件,如何更改列及其列名的输出值?假设我有表A,它有3列id,问候语,姓名,姓氏,性别select * from Aselectsalutation to Mr. else, set salutation to Ms. but then change the salutation into alias namePrefix
如何在oracle的纯
我正在学习猪,并有以下声明:> feb = LOAD 'hdfs:/201002hourlyx.txt USING PigStorage(',');> STORE month_quad INTO 'hdfs:/month_quad';
> SPLIT month_quad INTO split_jan IF (SUBS