sql查询后多出一条无效数据？

Posted 2023-04-27

select a.time as "time", coalesce(b.notEliminated,0) as "notEliminated", coalesce(b.eliminated,0) as "eliminated" from ( select to_char ( b, 'yyyy-mm-dd' ) as time from generate_series (to_timestamp (?, 'yyyy-mm-dd' ), to_timestamp ( ?, 'yyyy-mm-dd' ), '1 days' ) as b group by time order by time asc ) as a full outer join ( select to_char (create_date, 'yyyy-mm-dd') as starttime, count(case when s.security_state='未消除' then s.security_state else null end) as notEliminated, count(case when s.security_state='已消除' then s.security_state else null end) as eliminated from securitys s where s.deleted= '0' group by starttime ) as b on a.time=b.starttime order by a.time asc

参考技术A full Outer Join的作用：返回左右数据集的全部数据，左右有一边不存在的数据以None填充，请看一下是不是这个原因造成。

wwindows文件放入linux后多出换行符

将 windows文件移到linux系统下会在文件行末尾多了一个换行符^M

使用命令cat -v tmp.c可以看到每行后边有^M字符

为了解决这个问题，我们用如下命令：touch love_tmp.c (首先建立一个临时文件来保存没有特殊字符^M的内容) -- sed ‘s/^M//‘ love.c > love_tmp.c (接着用sed命令删除love.c文件中的^M，并将内容保存于临时文件love_tmp.c，这里要注意^M的输入为“CTRL+V”加上“CTRL+M”这两个必须连续输入) -- mv love_tmp.c love.c (最后将临时文件变为我们需要的文件love.c)

也可将其改写成脚本vi deletem.sh

touch love_tmp.c
sed ‘s/^M//‘ $1 > love_tmp.c
mv love_tmp.c $1

而后使用命令./deletem.sh doc