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MySQL (C API)VC实例及代码下载 （1）(2)

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Release： 2016-06-13 10:06:32
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10.SQL语句技巧

1、一个SQL语句的问题:行列转换

select * from v_temp

上面的视图结果如下:

user_name role_name

-------------------------

系统管理员 管理员

feng 管理员

feng 一般用户

test 一般用户

想把结果变成这样:

user_name role_name

---------------------------

系统管理员 管理员

feng 管理员,一般用户

test 一般用户

===================

create table a_test(name varchar(20),role2 varchar(20))

insert into a_test values('李','管理

Related labels：
api mysql select sql Example Skill of statement Convert question
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